Brooks glycerin 21

Learn more about the Brooks glycerin 21 female running shoes, including key features, performance, reviews, model updates, and more.

Brooks glycerin 21

Price

$329

Rating

High

Popularity

Very Popular

The Brooks Glycerin 21 is a high-cushioned neutral running shoe designed for maximum comfort, sitting at the top end of the Brooks lineup along with models like the Ghost for those who prioritize plush cushioning and a smooth ride.

Brooks
Brooks glycerin
14 colorways

Colorway: COCONUT/AQUA/AUTUMN SUN

Widths available: normal, wide

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Summary

The Brooks Glycerin 21 is a premium cushioned running shoe designed for comfort and support over long distances. It features Brooks' DNA LOFT midsole cushioning for a plush and responsive feel, as well as an OrthoLite sockliner for additional comfort. Positioned within Brooks's lineup of running shoes, the Glycerin 21 is ideal for neutral runners seeking maximum cushioning. Compared to other models like the Brooks Ghost, the Glycerin 21 offers a softer, more luxurious ride due to its enhanced cushioning system. It sits above models like the Brooks Adrenaline GTS, which provides more structured support, catering to those who need stability. Overall, the Glycerin 21 is tailored for runners who prioritize plush comfort and a smooth running experience.

Surface

road

Cushioning

MinLowMediumHighMax(31mm)

Category

ResponsiveBalancedComfort

Breathability

LowMediumHigh(double jacquard mesh upper)

Weight

286g

Heel-to-Toe Drop

10mm0mm14mm

Support

NeutralLightHigh

Width options

normal, wide

Grip

LowMediumHighMax

Suitability

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Pros & Cons

AI-powered

Fittir conducts a detailed analysis of the Brooks glycerin 21 to provide you with a comprehensive overview of the shoes features, pros, and cons based on 59 wear-tester reviews.

Most Mentioned Pros

Most Mentioned Cons

comfort (11)
firmness (9)
softness (6)
responsiveness (5)
foam (5)
midsole (4)
max (3)
stack (2)
Pros
"The Glycerin 21 features enhanced nitrogen-infused cushioning that provides a plush feel with better support."
cushioning
plush
DNA LOFT
"The Glycerin 21 features an extra layer of soft cushioning for enhanced comfort during runs."
cushioning
DNA Loft
comfort
"The cushioning provided by the nitrogen-infused DNA LOFT v3 is described as incredibly comfortable without being overly squishy."
soft
comfort
"The Glycerin 21 maintains a balanced midsole softness suitable for a variety of runners."
midsole
softness
comfort
"The DNA Loft V3 midsole offers an improved cushioned experience."
DNA Loft V3
cushioning
softness
"The Glycerin 21 provides a noticeably softer ride compared to its predecessor."
softness
midsole
comparison
"The Brooks Glycerin 21 features exceptionally soft cushioning which enhances the comfort during runs."
cushioning
comfort
soft feel
"The new DNA Loft version 3 offers improved softness and springiness."
foam
softness
springiness
"The Brooks Glycerin 21 features an enhanced nitrogen-infused DNA Loft V3 cushioning technology for a softer and more plush feel."
cushioning
soft feel
nitrogen-infused
"The shoe offers exceptional softness and comfort for longer runs."
softness
comfort
long runs
"The shoe features an added 2 mm of DNA Loft V3 cushion for improved comfort."
DNA Loft V3
cushion
soft ride
smoother ride
"The cushioning in the Brooks Glycerin 21 is exceptionally soft and comfortable, improving the overall running experience."
cushioning
midsole
comfort
"The neutral version provides extra cushioning for comfort during runs."
cushioning
comfort
"The midsole of the A6 GEL Nimbus 26 is noted for its plush softness, making it ideal for recovery runs."
plush ride
soft midsole
cushioning
"The Glycerin 21 features enhanced plush cushioning due to the added loft nitrogen injected foam."
plush
cushioning
foam
"The updated DNA Loft V3 midsole provides a softer feel compared to previous versions."
midsole
DNA Loft V3
"The shoe provides just enough softness for a comfortable running experience, especially for longer runs."
softness
long runs
"The Glycerin 21 features an incredibly soft cushion technology, enhancing the overall running experience."
cushioning
comfort
running experience
"The Brooks Glycerin 21 has improved cushioning compared to the Glycerin 20, making it feel softer underfoot."
cushioning
comfort
"The cushioning provides a great balance of being soft yet supportive, enhancing overall comfort during runs."
support
comfort
high cushion
"The Glycerin 21 features a 2 mm increase in stack height leading to enhanced cushioning."
cushioning
plusher ride
height increase
"The additional 2 mm stack in the shoe enhances cushioning."
cushioning
stack height
improvement
"The shoe provides a luxurious and plush ride with good energy return."
plush
bounce
softness
"The midsole design provides a plush ride while maintaining a degree of responsiveness."
plush
bounce back
comfort
"The shoe provides a cushioned yet responsive ride, allowing for a comfortable running experience."
cushioned
responsive
"The foam used provides a plush cushion ride along with responsiveness for better energy return."
DNA Loft
plush
energy return
"The shoe maintains a good balance of cushioning without feeling overly mushy, which supports a responsive run."
bounce
support
performance
"The shoe has a responsive, yet soft feel which enhances the running experience."
Nitro foam
responsive
cushioning
"The midsole foam provides a good balance of protection without being too firm or too soft."
protection
stability
"The Brooks Glycerin 21 offers a soft and cushioned experience, balancing comfort and performance."
softness
cushioning
performance
"The Brooks Glycerin 21 features an enhanced DNA Loft v3 cushioning system for improved comfort."
DNA Loft v3
cushioning
out-of-the-box comfort
"The cushioning in the Glycerin 21 is plush and enhances comfort during runs."
cushioning
comfortable
long-distance
"The shoe has improved cushioning that enhances comfort during long runs."
cushioning
comfort
protection
"The Brooks Glycerin 21 offers super soft cushioning that enhances comfort during runs."
cushion
softness
comfort
"The glycerin 21 is noted for its exceptional cushioning, ideal for long-distance runs."
max cushion
long distance
soft
daily trainer
"The shoe provides a plush and enjoyable underfoot experience thanks to its improved midsole foam."
DNA Loft V3
enjoyable
soft
"The cushion provided in these shoes enhances comfort during runs."
softness
impact reduction
"The cushioning in the Brooks Ghost Max is designed to provide ample comfort, especially during longer runs."
cushioning
protection
stability
"The shoe's midsole is made from a soft, nitrogen infused foam designed for daily training."
soft foam
daily trainer
nitrogen infused
"The updated midsole has a softer feel compared to previous models, enhancing comfort during runs."
softness
comfort
midsole
"The shoe provides excellent cushioning for a comfortable run."
cushioning
softness
bounce
"The DNA LOFT v3 foam offers an enjoyable squish-to-bounce ratio for a smooth ride."
balance
responsive
soft
"The supercritical midsole design enhances the overall running experience with balance and energy return."
midsole
energy
comfort
"The midsole cushioning has been improved and is well-suited for longer runs and recovery miles."
DNA Loft V3
comfort
daily training
"Both the Ghost 16 and Glycerin 21 demonstrate excellent cushioning, making them suitable for daily training."
DNA Loft V3
comfortable
plush
"The Glycerin 21 features enhanced cushioning that improves overall comfort during runs."
cushioning
comfort
performance
"The cushioning technology used in the Glycerin 21 offers a bouncier ride compared to previous models, enhancing comfort."
bounciness
cushion technology
DNA Loft
"The shoes are equipped with a Nitrogen infused midsole that enhances durability and provides a bouncy feel."
cushion
durability
nitrogen_infusion
"The DNA Loft v3 technology provides a unique balance of softness and firmness for various activities."
DNA Loft
softness
firmness
"Both shoes use the same advanced foam technology which enhances comfort and reduces weight."
DNA Loft V3
nitrogen infused
lightweight
"The shoes provide excellent cushioning while maintaining a firm feel that aids in shock absorption during runs."
cushion
firm
shock_absorption
"The midsole material, DNA Loft V3, provides effective shock absorption and comfort during runs."
DNA Loft V3
shock absorption
softness
"The Glycerin 21's midsole features Brooks' DNA Loft v3 foam which offers significant cushioning."
DNA Loft
cushioning
softness
"The updated foam provides a moderately soft feel, allowing for comfortable runs while not feeling overly bouncy or firm."
foam
cushioning
comfort
"The DNA LOF V3 foam in the Brooks Glycerin 21 provides a solid daily training experience."
DNA LOF V3
daily trainer
"The new DNA Loft V3 foam in the Ghost 16 provides a softer and more enjoyable underfoot experience."
DNA Loft V3
softness
Midsole
"Both shoes use Brooks' new DNA Loft V3 foam for excellent cushioning."
cushioning
DNA Loft V3
comfort
"The midsole delivers reliable shock absorption during long runs without feeling overly restrictive."
shock absorption
comfort
"An added two millimeters of DNA Loft v3 foam improves the overall cushioning of the shoe."
DNA Loft
extra foam
cushion improvement
"The new midsole has improved cushioning with an additional 2 mm thickness compared to its predecessor."
midsole
cushioning improvement
"The shoe is equipped with ample cushioning for a plush sensation."
padding
plush
comfort
"The Brooks Glycerin 21 provides ample cushioning for long runs."
cushioning
long runs
"The Brooks Glycerin 21 has significantly improved cushioning that offers a comfortable ride for daily runs."
cushioning
comfort
daily runs
"The heel cushioning is particularly noted as being very good, enhancing the overall comfort."
heel comfort
cushioning
"The increased midsole stack enhances cushioning and protection."
midsole
DNA Loft V3
cushioning
"The cushioning in the Glycerin 21 is plush and offers great comfort for long runs."
comfort
long run
cushion
midsole
"The Glycerin model features additional foam for a more plush and soft experience."
Glycerin
extra foam
softness
"The Brooks Glycerin 21 offers a plush level of cushioning, making it ideal for comfort and protection during runs."
cushioning
comfort
protection
"The midsole has been updated to include 2 mm of extra foam, enhancing cushioning."
midsole
cushioning
enhancement
"The Glycerin Max uses new DNA tuned foam which improves overall comfort and ride quality."
new foam
improved comfort
"Both shoes provide ample cushioning, suitable for long-distance runs."
long-distance
cushioning
"The Brooks Glycerin 21 features a lightweight design despite its substantial appearance."
lightweight
design
"The Glycerin 21 offers enhanced cushioning with an increased stack height compared to its predecessors."
max cushion
stack height
"The glycerin 21 features increased stack height for enhanced cushioning without a significant weight increase."
stack height
lightweight
cushion
"The midsole's stack height has been increased for improved comfort."
stack height
comfort
"Increased stack height contributes to improved cushioning."
cushioning
stack height
improvements
"This shoe features a medium stack height which provides a balanced feel."
medium
height
balance
"The Glycerin 21 features enhanced cushioning for improved comfort."
cushioning
comfort
midsole
"The new model features a noticeable increase in stack height, providing better overall support and cushioning."
stack height
cushioning
support
"The Glycerin 21 features an increased stack height for improved cushioning."
cushioning
stack height
"Both the Brooks Ghost Max 2 and the Glycerin 21 provide excellent cushioning for daily training."
cushioning
daily trainer
max cushion
"The Brooks Glycerin 21 offers excellent cushioning that enhances comfort during runs."
cushioning
comfort
max cushion
"The Brooks Glycerin 21 features max cushioning for enhanced comfort during runs."
cushioning
comfort
DNA Loft foam
"The Brooks Ghost Max 2 is heavier but offers a more cushioned experience."
cushioning
heavier
"DNA Loft version 3 foam offers a cushy feel for running."
cushioning
foam technology
"The Ghost 16 features an impressive stack height, providing a cushioned running experience."
cushioning
heel height
drop
"The Glycerin 21 offers excellent cushioning thanks to its higher stack height."
cushioning
stack height
comfort
"Brooks Glycerin 21 provides a solid bounce for a max cushioned shoe."
solid bounce
max support
stable cushioning
"The Brooks Glycerin 21 offers excellent cushioning, making it a solid choice for comfortable long runs."
long runs
cushioning
"The Glycerin 21 provides a comfortable run with ample cushioning."
cushioning
comfort
long runs
"The DNA Loft version 3 foam provides a better ride."
DNA Loft
ride quality
foam
"The shoe offers ample cushioning in the heel."
foam
heel
cushioning
"The nitrogen-infused DNA Loft V3 material offers responsive cushioning."
DNA Loft V3
nitrogen infused
responsive
"The Brooks Glycerin 21 is a premium daily trainer with a luxurious feel and ample cushioning."
premium
cushioning
daily training
"The Brooks Glycerin 21 offers substantial cushioning for a comfortable running experience."
cushioning
comfort
"The shoe uses DNA Loft foam which adds responsiveness."
responsive
DNA Loft
cushioning
"The Triumph 21 features a balanced foam that feels soft while still providing good energy return."
softness
energy return
"There is a pleasant energy return experience with the updated midsole, which adds enjoyment while running."
energy return
enjoyment
"The Sockony Triumph 21 provides a cushioned daily trainer option that excels on easy and long runs."
cushioned
daily use
"The Glycerin 21 offers a substantial amount of cushioning, making it ideal for longer runs."
cushioning
long runs
"The shoe offers a good balance of cushioning and rebound, improving responsiveness during runs."
responsiveness
cushioning
bounce
Cons
"The shoe has a relatively firm feel compared to other high-cushion options."
cushion
firmness
"Not ideal for runners who prefer firmer cushioning."
soft
responsiveness
cushioning
"The shoe still feels relatively firm despite the improvements."
softness
springiness
cushioning
"Glycerin 21 feels firmer at the heel."
stiffness
heel
"The shoe feels a bit firm despite being a max cushion version."
max cushion
firm feel
"The DNA Loft 3 foam feels firm rather than soft, which may not suit every runner's preference."
firm
comfort
"The shoe may not provide excessive cushioning for those who prefer a softer feel."
cushioning
not plush enough
"The shoe feels firmer than expected for a max cushion shoe, which might disappoint users seeking maximum softness."
cushioning
comfort
firmness
"The shoe's cushioning becomes firmer while running, which may not suit everyone's preference."
cushioning
running experience
"The Glycerin 21 may feel too soft for those seeking a responsive ride."
soft
lack of responsiveness
"The shoe may be too soft for those seeking responsiveness."
softness
bounce
"The shoe may feel too soft for some runners, lacking in responsiveness."
softness
comfort
cushioning
"The ride isn’t as soft or responsive as some runners might prefer in a max cushioned shoe."
cushioning
firmness
"Runners looking for more responsiveness might find it lacking due to the soft cushioning."
responsiveness
cushioning
"Runners may feel the extra soft cushioning is not suitable for more demanding runs."
softness
not for demanding runs
"Even with an increase in cushioning, it may not feel as squishy as competitors."
cushioning
softness
comparison
"The cushioning is not as soft as advertised compared to competitors."
advertising
comparison
"The shoes may feel too firm initially, which might not suit all runners' preferences."
firmness
initial feel
"The Glycerin 21 is firmer compared to previous models, lacking the advertised super soft cushioning."
cushioning
firmness
"The shoe may not provide the plush feel that some runners expect from a Max cushioned option."
max cushion
comfort
soft feel
"The midsole may be too soft for some runners, potentially leading to discomfort on longer runs."
soft
cushioning
discomfort
"The cushioning may feel too soft for some runners."
cushioning
softness
"The cushioning does not compress much during runs, which may affect the overall feel for some runners."
cushioning
comfort
"The shoe feels more like a max cushion shoe, which could be limiting for speed work."
max cushion
softness
speed
"The cushioning is not as responsive as expected and lacks bounce."
cushion
soft
bounce
"There is a noticeable height increase that may feel unusual for some runners."
tall feel
stack height adjustment
"The Brooks Glycerin 21 has a lower stack height, which may not provide enough cushioning for some runners."
less cushion
lower stack
"The review lacks any mention of specific negatives regarding cushioning."
"Ghost 16 offers a more moderate cushioning experience, potentially lacking for runners seeking maximum cushioning."
cushioning
comfort
versatility
"Runners looking for more extreme cushioning might find this shoe lacking."
max cushion
plush feel
"The overall cushioning in the Ghost 16 is firmer and less plush compared to the Glycerin 21."
firm cushioning
less plush
"The midsole is not as soft and squishy as some might expect, affecting the first feel on foot."
midsole
cushioning
first feel
"The midsole of the GEL Nimbus 26 is described as being softer than the Glycerin 21, which might not appeal to every runner's preference."
soft ride
not plush
"The PowerRun Plus foam in the Triumph 21 is described as dense with less energy return compared to the DNA Loft V3 foam in the Glycerin 21."
PowerRun Plus
density
long runs

breathability (13)
upper (7)
collar (4)
padding (3)
plushness (3)
temperature (3)
tongue (2)
step-in (2)
Pros
"There is a plush tongue that adds to the comfort while preventing tightness in the shoe's fit."
plush
no tightness
"Reviewers appreciate the breathable and structured design of the upper, contributing to overall comfort."
breathability
comfort
structure
"The improved design includes a breathable engineered mesh upper for comfort during runs."
breathable
comfort
"The engineered mesh upper of the Ghost Max 2 allows for better breathability compared to the Glycerin 21."
breathable
comfort
"The upper of the Ghost is highly breathable compared to other models, enhancing comfort during runs."
breathability
comfortable
"The new warp knit upper provides breathability and flexibility."
breathable
flexible
upper material
"The new upper design in both shoes enhances breathability, adding to overall comfort during runs."
upper design
fit
"There are large ventilation zones in the toe box, contributing to breathability and comfort during runs."
ventilation
comfort
"The upper material of the Brooks Glycerin 21 is flexible and breathable, contributing to overall comfort."
upper material
flexibility
comfort
"The Glycerin Stealthfit 21 is noted for its extreme comfort."
comfortable
casual use
"It offers a comfortable ride with enough cushioning for long daily training runs."
comfortable
cushioned
daily trainer
"The overall comfort of the shoe is noteworthy, making long runs enjoyable."
comfort
long runs
cloud-like
"It features deluxe plush materials and a well-padded tongue for added comfort."
plush
padded
"The shoe includes a traditional feel that contributes to its overall comfort and ease of use."
traditional
easy use
"The shoe provides a plush and premium feel, especially around the heel collar."
heel collar
premium feel
wider platform
"The shoe features a soft and luxurious warp knit upper that balances comfort and security."
soft
supportive
breathable
"The Glycerin 21 prioritizes upper comfort with a padded collar and stout heel counter."
padding
heel counter
fit
"The breathable mesh upper contributes to comfort."
mesh
breathability
comfort
"The shoe's upper design provides a comfortable and secure fit around the heel, enhancing overall comfort during runs."
heel comfort
secure fit
"The upper of the shoe has been tweaked for better comfort."
upper design
comfort
fit
"The shoe features a comfortable upper that enhances overall running experience."
comfort
lockdown
padded
"The upper material feels soft and well-constructed."
soft
material quality
"The shoe features excellent tongue padding, enhancing comfort for runners who prefer a snug fit."
comfort
padding
fit
"The Glycerin 21 enhances comfort with its luxuriously padded upper and smooth lining."
comfort
soft upper
luxurious
"This shoe maintains a good level of comfort with ample plush padding, especially in the heel area."
plush
heel padding
overall comfort
"The upper of the Glycerin 21 is luxuriously padded, adding to overall comfort during runs."
comfort
upper
padded
"The Glycerin 21 is also recognized for its extreme comfort due to its plush padding."
comfort
plush padding
Brooks Glycerin 21
"The shoe features a plush padded tongue which enhances comfort."
tongue
padding
"The shoe has a plush and padded upper that enhances comfort."
plush
comfortable
upper
"The shoe provides a comfortable experience for both walking and running."
comfort
walking
running
"The plush feel underfoot provides smooth sensations while running, making it enjoyable for long runs."
comfort
smooth
running experience
"Both shoes have a plush, comfortable upper that ensures a good fit."
plush upper
comfort
"There is a plush feeling around the collar of the shoe which enhances comfort during runs."
collar
comfort
sensitivity
"The shoe is versatile enough to be a good walking shoe as well as a running shoe."
walking
running
multi-purpose
"Step-in comfort is consistent with previous models, providing a plush feeling."
step-in
plush
familiarity
"The shoe offers ample cushioning for heel strikers, making it suitable for various running styles."
heel_strikers
cushioning
versatility
"The Brooks Glycerin 21 offers exceptional comfort with its plush DNA Loft cushioning."
comfort
cushioning
smooth ride
"The Glycerin 21 offers exceptional step-in comfort making it an ideal shoe for long training runs."
comfort
soft
cushioned
"The Glycerin 21 is designed for high comfort even during prolonged use, preventing discomfort and fatigue during longer runs."
long_runs
comfort
fatigue_prevention
"The shoe provides a plush and well-wrapped fit due to its warp knit upper."
knit material
fit
lockdown
"The shoe provides a smooth and comfortable ride for daily runs."
comfort
daily_running
wearability
"There is good step-in comfort right from the start with a hugging feel."
step-in comfort
hugging feel
plush padding
"The shoe feels incredibly soft and comfortable when walking around."
softness
comfortable
"The cushioning and support features of the GTS model reportedly ease pressure on joints during runs."
comfort
support
"The uppers of both shoes provide a soft and plush feel, enhancing overall comfort."
plush
soft upper
comfortable
"The upper warp net material allows for excellent ventilation."
warp net
breathability
ventilation
"Both shoes are reported to have a good level of padding in the heel, enhancing comfort during runs."
padding
heel comfort
overall comfort
"The shoes feature a soft lining that enhances comfort when wearing them."
soft
comfort
"The shoe maintains comfort with a firm ride without being overly soft."
comfort
firmness
not mushy
"The Glycerin offers a softer feel and smoother ride, making it more enjoyable for longer runs."
soft
smooth
long runs
"The Nimbus 26 provides an exceptionally soft and comfortable ride, described as cloudlike and pillowy."
comfort
soft
Nimbus 26
"The heel collar provides exceptional comfort, acting like a pillow around the heel without causing slip."
plush heel
comfort
no heel slip
"The increased stack height enhances the plush feel and overall comfort right from the first wear."
plush
comfort
"The Brooks Glycerin 21 features a plush heel collar that enhances comfort during runs."
plush collar
comfort
heel support
"The A6 GEL Nimbus 26 features a well-designed heel collar that grips the ankle comfortably."
ankle grip
comfort
heel support
"The shoe's comfort collar adds a plush feel around the ankle, enhancing overall comfort."
anxiety
comfort
collar
"The plush hill collar and tongue enhance comfort."
plush
comfortable
"A softer sandwich air mesh upper offers luxurious comfort and feel on the foot."
mesh
comfort
upper
"The stealth fit version makes it very convenient for runners to put on and take off quickly."
easy to wear
comfort
"The Glycerin 21 is described as a more fun shoe to run in compared to the Glycerin 20, enhancing the running experience."
fun
running experience
"Both shoes provide a very comfortable fit around the ankle, offering a plush feel that enhances the overall comfort."
plush
comfortable
step-in feel
"The shoe has a cushioned heel that provides comfort for heel strikers, making it a better option for those who prefer a stiff heel counter."
stiff heel counter
cushioned heel
comfort
"The upper material is plush, contributing to overall comfort during runs."
upper material
comfort
plush
Cons
"The upper material retains heat, making it very warm during runs."
heat
comfort
"Breathability is limited due to the thick knit upper, making it unsuitable for warm weather."
ventilation
warmth
"The upper lacks some breathability compared to the previous version."
breathability
upper
"The new upper material reduces breathability compared to previous models."
breathability
comfort
design
"The upper may cause discomfort in warmer weather due to lack of breathability."
heat
upper
comfort
"Breathability of the stealth fit version is not as good as the original version."
breathability
upper
"The shoe may not provide enough breathability for long runs."
breathability
long runs
"Breathability is superior in the Glycerin compared to the Ghost."
breathability
mesh
comfort
"There's limited breathability, which may lead to overheating in warmer conditions."
warmth
breathability
"Both shoes lack sufficient breathability, leading to discomfort during longer runs."
breathability
heat
comfort
"The breathability of the knit upper is average, limiting comfort during longer runs."
breathability
knit material
comfort
"The upper is not very breathable which may lead to discomfort during hot weather."
mesh
heat
humidity
"The Brooks Ghost 16 lacks breathability."
heat
comfort
breathability
"The tongue padding might be excessive, which could lead to unnecessary bulk."
bulkiness
padding
"The tongue of the shoe might be too thick for some runners leading to possible discomfort."
tongue
comfort
"Though there's an excess of padding, it may not suit everyone's preference."
excess padding
comfort level
"The upper is on the warmer side, which may impact comfort during longer runs."
upper
warm
comfort
"The warm upper of both shoes may cause discomfort in hotter conditions."
thick upper
heat
"The shoe is stiff at the start, requiring a break-in period that may be inconvenient for some runners."
break-in period
stiffness
"The tongue design is inadequate, leading to comfort and fit issues."
tongue
gusseted
comfort
"The shoe may be too bulky for runners who prefer a lighter feel."
heavy
personal preference
bulk
"The Brooks Ghost Max 2 feels chunkier, which may not be suitable for everyone."
chunky
heavy
feel
"While the upper is padded, it is also reported to be extremely warm during runs."
comfort
warmth
"The traditional upper can be too warm, especially in hot conditions."
warmth
upper material
"The shoe is still considered warm, similar to its predecessor."
warmth
breathability
"The design of the heel counter may irritate."
irritation
design
"Tongue bulging in Glycerin Max could cause discomfort."
bulging
fit
"The knit fabric used in the stealth fit version lacks elasticity, which may not be optimal for some runners."
material
knit
"The review lacks attention to long-distance comfort over time."
comfort
endurance
"The review does not specify any comfort issues despite mentioning the shoes are comfortable."
"The increased stack height might not suit all runners' preferences."
stack height
preference
"The tongue of the Ghost 16 causes irritation due to excess fabric."
irritation
comfort
tongue
"The shoe's tongue is not gusseted, which could affect comfort during runs."
gusseted
comfort
"The Ghost 16 has less padding in the heel counter compared to the Glycerin."
heel counter
padding
stiffness
"Although the shoe is comfortable, it does not provide a significant change from its predecessor."
comfort
similar design
"The insole is described as average with no additional cushioning compared to competitors."
insole
cushioning
average
"The Glycerin 21 generally feels more accommodating and comfortable for longer runs than the Ghost 16."
comfort
accommodating
"The Ghost 16 may not provide sufficient comfort during longer distances due to its firmer feel."
long distance
firm feel
"The heel counter of the Glycerin 21, while rigid, is not preferred over the Nimbus 26, suggesting a potential comfort issue."
rigid
comfort preference
"The stiff heel counter may be uncomfortable for those sensitive to rigid structures in shoes."
comfort
heel counter
"The Brooks Glycerin 21 feels firmer than the Triumph 21, which may detract from comfort over longer distances."
firmness
long runs
comfort
"The older model might feel firmer, which some runners may find less enjoyable."
firm
ride
"The lacing system can create moderate lace pressure which affects comfort."
lacing
pressure
comfort
"The differences in midsoles might take some time to get used to and feel different for runners transitioning from the previous model."
transition
adaptation
"The knit upper of the Glycerin 21 may run warmer."
warmth
upper
material
"Both shoes may feel overloaded in warmer conditions."
overheating
weather
comfort
"The shoe may feel somewhat stiff for those accustomed to more flexible footwear."
comfort
flexibility

outsole (5)
construction (2)
weight (2)
lightweight (2)
workhorse (1)
minimal wear (1)
materials (1)
longevity (1)
Pros
"The build quality of the Glycerin 21 is durable, showing little wear even after extensive usage."
durability
wear resistance
"Durability is a strong point for both shoes, indicating they are designed to withstand regular use."
rubber
durability
wear-resistance
"The shoe is lightweight despite the increased midsole height, making it easier to run."
lightweight
efficiency
"The shoe is lighter than previous models despite the increased cushioning."
lightweight
performance
"The weight difference between the two shoes is minimal, making both options fairly lightweight for their category."
lightweight
similar weight
"The robust outsole provides exceptional durability and support for long-distance running."
outsole
durability
performance
"The shoes are built to last with a durable outsole that withstands various running surfaces."
durability
outsole
lasting
"The updated outsole design enhances flexibility while maintaining durability, even with heavy use."
flexibility
durability
traction
"The overall durability of the outsole shows promise, as it showed no signs of wear after initial use."
durability
rubber
longevity
"The outsole offers durability and good ground contact for various surfaces."
durability
outsole
mileage
"The grip and durability of the outsoles on both shoes are excellent, providing support during runs."
excellent outsoles
durability
"The outsole uses durable materials which extend the shoe's life and improve grip."
rubber coverage
durability
grip
"The new Road Track outsole enhances the shoe's durability significantly."
durable
Road Track
improvements
"Both shoes exhibit excellent durability with plenty of rubber coverage on the outsoles."
durability
rubber coverage
"Brooks has utilized durable rubber in the outsole, indicating long-lasting wear."
durable
long-lasting
rubber
"The Glycerin 21 has a strong outsole, ensuring durability for high mileage running."
durability
high mileage
reliability
"The Glycerin 21 offers good durability with a thick rubber outsole."
durable
thick rubber
"The outsole is durable due to the extensive use of rubber."
durability
outsole material
"The shoe provides a durable option for high mileage training."
durability
high mileage
training
"The shoe shows excellent durability, with minimal wear even after extensive use."
durability
long distance
outsole
"The dual formed rubber outsole enhances durability and lightness."
durable
lightweight
"Users can expect good longevity and durability from the shoe."
durability
long-lasting
good structure
"These shoes are durable and hold up well over time."
durable
long-lasting
wear-resistance
"The construction quality of the shoe is impressive and indicates durability."
construction
quality control
durability
"The durability of both shoes is impressive, allowing for plenty of running time without wear."
durability
long-lasting
"The Brooks Glycerin 21 is lighter than the Asics Nimbus 26, making it feel more nimble."
lightweight
nimble
Brooks Glycerin 21
"The shoe is surprisingly lightweight considering its cushioning and structure."
lightweight
cushioning
surprising
"The durability of the Brooks Glycerin 21 is emphasized as it lasts a long time, making it a reliable choice."
long-lasting
reliable
workhorse
"Although there is less rubber on the outsole, the shoe remains durable thanks to the quality of the midsole foam."
outsole
midsole
"The shoe offers good rubber coverage in the outsole, contributing to long-lasting durability."
outsole
durability
"The foam used in both models is resilient, providing a consistent ride across different terrains."
foam
durability
consistent
Cons
"There's a concern that with less rubber on the outsole, durability may be compromised in the long run."
less rubber
durability
outsole
"The outsole's rubber compounds might not offer the expected durability."
durability
rubber
"There is less rubber on the outsole, which might affect durability."
outsole
durability
material
"The outsole of the GEL Nimbus 26 is criticized for being thinner and possibly less durable compared to the Glycerin 21."
thin rubber
durability issues
"The outsole provides a classic feel but lacks significant advancements in durability."
outsole
durability
classic
"The outsole's lower durability may lead to quicker wear, especially under heavy use."
outsole
soft rubber
"There are concerns about the durability of the shoe after high mileage runs."
durability
mileage
performance
"The review doesn't mention any specific durability concerns."
"The shoe is on the heavier side, which could be a concern for some runners."
heavy
weight
"The weight of the shoe may still be a concern for runners seeking ultralight options."
weight
lightness

speed (12)
responsiveness (9)
versatility (6)
weight (5)
lightweight (3)
geometry (3)
energy_return (3)
transitions (2)
Pros
"The Glycerin 21 is lightweight for its level of cushioning, allowing for fast turnover."
lightweight
fast turnover
"The Glycerin 21 is surprisingly lightweight for a cushioned shoe, making it suitable for various running paces."
performance
lightweight
cushioning
"The shoe is lighter compared to its predecessor, which helps with performance during runs."
lighter
performance
run efficiency
"The shoe performs well on uneven and clumped gravel surfaces, offering a stable ride."
gravel
stability
"The shoe is designed for long-distance running, providing comfort and reducing fatigue over extended runs."
long-distance
resilient midsole
energy-saving
"The new flex groove placement in the outsole adapts to impact stresses, enhancing overall performance."
flex groove
impact stress
midsole compression
"The Glycerin 21 is lighter than its predecessor, contributing to an agile running feel."
lightweight
performance
"The shoe's lighter weight contributes to a more nimble feel during runs."
lightweight
nimble
running
"Many runners might find the shoe surprisingly light despite its cushion."
lightweight
cushioned
riding feel
"Despite its lighter weight, the Ghost 16 offers a reliable and comfortable ride."
lightweight
performance
reliable
"The shoe maintains a balanced weight, neither too heavy nor too light."
balanced weight
middle category
"The shoe has been made slightly lighter while maintaining its plush feel."
lightweight
performance
upper
"The Glycerin 21 offers a lightweight feel, which can be beneficial for longer runs."
lightweight
performance
running efficiency
"The shoe maintains its weight despite the additional cushioning, making it an appealing option."
lightweight
performance
comfort
"The nitrogen-infused foam in the Glycerin 21 improves the shoe's lightweight feel and responsiveness."
lightweight
responsive
"The shoe has a modest weight reduction compared to previous models, enhancing overall feel and performance."
weight
performance
"The ride of the shoe is smooth and predictable, ideal for daily running."
performance
smooth ride
daily running
"The Glycerin 21 is a great shoe for easy runs and treadmill running due to its cushioning."
easy runs
treadmill
cushioning
"The absence of a rocker allows for a natural feel during runs, accommodating various running styles."
performance
natural
running_style
"The shoe offers smooth transitions through the gait cycle, making it uncomplicated for daily use."
gait
simplicity
daily trainer
"The transitions while running are smooth, making for an enjoyable running experience."
smooth
running experience
performance
"The Glycerin 21 is suitable for various types of runs due to its balanced blend of softness and responsiveness."
neutral trainer
responsive
balanced feel
"This shoe performs well for various running situations, showing versatility in its use."
multi-purpose
running styles
"The shoe works well as a daily trainer for a variety of runs including long and easy runs."
daily training
long runs
"The shoe is versatile enough for various types of running, including long runs and tempo work."
daily runs
tempo
long runs
"These shoes are versatile and suitable for various types of workouts."
versatile
workouts
"The Glycerin 21 is versatile enough for both easy runs and faster-paced workouts."
versatile
daily running
responsiveness
"The Triumph 21 is described as a versatile shoe suitable for different running paces, providing a punchy feel when quickening up."
pacing
versatile
"The shoe maintains good versatility for a variety of running paces and styles."
multi-purpose
versatile
"The overall versatility of the Glycerin 21 makes it suitable for a wider range of running activities, including longer runs."
versatile
long runs
performance
"The shoe performs well for short bursts of speed."
speed
performance
short_runs
"Transitioning through the midfoot is smooth, enhancing the overall running experience."
smooth
transition
running
"The outsole design improves heel-to-toe transition during running."
heel-to-toe
transition
"The shoe's ride is well-balanced, providing comfort without being overly soft."
well-balanced
nicely cushioned
resilience
"The cushioning's balance between comfort and responsiveness makes both shoes enjoyable for various paces."
responsive
versatile
"The shoe maintains good cushion without feeling dull during runs."
cushion
not dull
comfort
"The Glycerin 21 has a more flexible forefoot due to design changes in the outsole, improving the running experience."
outsole
flexibility
performance
"The shoe allows for pleasant flex through the forefoot, enhancing overall running experience."
forefoot
flex
running experience
"The Brooks Glycerin Max has a rocker geometry that enhances smooth transitions and feels more responsive."
rocker
smooth transitions
"The rocket geometry in the new version provides improved transitions during runs, enhancing the runner's experience."
rocker geometry
transitions
"The Glycerin 21 features an updated, more aggressive rocker geometry, improving the running experience."
rocker
aggressive
"The Glycerin is designed for long-distance running, making it ideal for marathon training."
marathon
endurance
"The Brooks Glycerin 21 benefits both performance and the environment, making it a dual-purpose choice."
performance
environment
running
"The shoes' performance in a 5K demonstrates their effectiveness for runners."
5K
endurance
"The Ghost 16 maintains a smooth ride, making it effective for various running styles."
smooth
reliable
versatile
"The review highlights that the Brooks Glycerin 21 has a light and responsive feel due to its DNA Loft V3 foam."
responsive
energy return
midsole
"The Brooks Glycerin 21 offers a more springy and responsive ride compared to the Nimbus 26."
responsive
performance
Brooks Glycerin 21
"Overall, both shoes provide a consistent ride throughout long runs, maintaining their comfort level."
consistency
long runs
"The Brooks Glycerin 21 utilizes nitrogen bubbles in its construction, enhancing its lightweight and performance."
lightweight
performance
rebounds
"The updated midsole technology offers better energy return and responsiveness during runs."
responsiveness
energy return
"The overall improvements in midsole and outsole design contribute to a more responsive and adaptable shoe."
adaptability
responsiveness
"The ride of the shoe has been improved dramatically, providing a nice balance of softness and energy return."
ride
performance
energy return
"The shoe is reliable for daily training with good performance across a variety of paces, especially at easy paces."
daily trainer
performance
easy pace
"It is designed specifically for road running, making it suitable for that purpose."
road running
performance
"The Brooks Glycerin 21 has a more pronounced rocker than the 20, promoting a more efficient stride."
rocker
efficiency
performance
"The shoe provides a firm yet comfortable ride, suitable for various running paces."
firmness
comfortable ride
"The construction of both shoes allows for a smooth ride from heel to toe, enhancing the running experience."
smooth ride
heel to toe
geometry
Cons
"The Glycerin 21 may not be the best choice for speed workouts."
training
speed
performance
"Despite being cushioned, the shoe does not feel fast during runs."
cushioned
not fast
"The shoe has a slow turnover, making it less suitable for speed work."
slow
turnover
"The shoe may not be ideal for speed-focused runs."
performance
speed
race
"The shoe does not perform well at high speeds, making it unsuitable for fast-paced runs."
high-speed
run types
"The shoe does not feel fast during runs."
slow
pace
"The shoe feels best suited for easy and recovery runs rather than speed."
performance
stability
"The Glycerin 21 isn't suitable for speed-focused runs, limiting its versatility."
speed
track workouts
intervals
"The Glycerin 21 may not perform as well in faster efforts compared to the Ghost Max."
effort
pace
"The shoe is not ideal for speed."
speed
performance
"The shoe lacks responsiveness and is not designed for faster runs."
not for speed
long runs
"The shoe lacks high-speed performance capability, making it unsuitable for tempo runs."
tempo
high-speed
performance limitations
"The ride lacks energy compared to other max-cushioned shoes."
ride
performance
"The transition feels smooth but lacks responsiveness, particularly at faster paces."
transition
responsive
slow
"The shoe lacks bounciness and energy return, which may disappoint runners seeking a responsive feel."
bouncy
energy return
smooth ride
"The shoe lacks responsiveness, making it feel less exciting during runs."
responsiveness
foam
exciting
"The cushioning may not provide the desired responsiveness for faster paces."
performance
cushioning
speed
"The shoe lacks excitement and responsiveness during runs."
predictable
foam
lack of bounce
"The midsole can feel a bit slow when pushing the pace, limiting its use for faster runs."
slow
tempo runs
performance
"The Glycerin 21 lacks responsiveness when compared to the Ghost Max."
midsole
energy return
"The reviewer finds the Glycerin 21 to be a little more ponderous, lacking the snappiness required for faster sprints."
ponderous
responsiveness
fast runs
"The foam, while comfortable, lacks responsiveness and energy return during runs."
energy return
bounce
comfort
"The shoe is primarily suited for slow to easy runs rather than fast paces."
slow
easy runs
"Some runners might desire more energy retention from the midsole during runs."
energy loss
midsole
efficient performance
"The Glycerin 21 uses materials that feel less exciting compared to competitors at a similar price point."
materials
competition
price
"Overall, the shoe's experience was described as boring, which may not appeal to all runners."
boring
experience
running
"The shoe is not suitable for high-intensity runs."
high-intensity
performance
"Absence of a rocker may lead to a reduced smoothness of the stride for some runners."
rocker
smoothness
"DNA Loft v3 foam lacks significant energy return for performance-oriented runs."
energy
foam
performance
"The Nimbus 26 may feel too soft for some runners, offering a mushy experience that lacks energy return."
softness
mushy
performance
"The performer of the Triumph 21 appears to be more enjoyable and offers better energy return at slower paces compared to the Glycerin 21."
energy return
performance
slow paces
"Some users may find the weight of the shoe to be a bit limiting."
weight
speed
"The shoe's weight becomes noticeable during speed work, which may affect performance."
weight
speed
performance
"The shoe is considered heavy for a running shoe, which may hinder performance."
heavy
performance
"The GEL Nimbus 26 is significantly heavier than the Glycerin 21, which may affect performance."
heavy
weight difference
"This shoe is heavy compared to others in its class, making it less ideal for speed work."
speed
heavy
tempo
"The ride is more suited for easy and medium-paced runs, limiting versatility."
daily trainer
easy runs
"Increased cushioning has led to a loss of versatility in running at faster paces."
cushioning
performance
versatility
"Glycerin 21 lacks versatility for faster runs."
performance
speed
"The shoe may not be the best option for those seeking a true all-purpose shoe due to its limitations in certain areas."
all-purpose
versatility
not for racing
"The shoe lacks pace versatility, making it feel sluggish."
pace
versatility
"The Glyerin 21 is more versatile while the Nimbus 26 is less suited for faster paces, reflecting its limitations in performance."
versatility
performance
"Lack of lively performance when attempting to pick up the pace."
pace
treadmill performance
"There was a lack of a rocker feel which could hamper quicker transitions during runs."
rocker
transitions
performance
"The first impression doesn't provide a deep analysis of performance."
first impression
early usage
"No performance-related negatives are identified."
"The overall identity of the Ghost 16 feels overly familiar with no significant innovations."
familiarity
performance
innovation
"The Ghost Max offers a better ride for picking up the pace."
pace
effort
"While the shoe has many positive features, there is little mention of advanced performance capabilities."
reliability
durability
"The shoe feels overly flexible, which may require more effort from the runner."
flexibility
effort
energy loss
"The feel difference between the drop may not be discernibly impactful during a run."
drop
performance
feel
"The overall softness of the shoe while walking may not translate well to running performance."
performance
walking vs running

width (5)
breathability (4)
tongue (4)
length (4)
secure (3)
heel (3)
toe box (2)
snugness (2)
Pros
"The shoe offers a spacious and comfortable toebox, improving the overall fit for runners."
spacious
comfort
"The upper is crafted with a new material, making it more flexible and breathable."
flexibility
breathability
"The upper of the shoe fits well and feels similar to the previous version, providing a good fit."
fit
upper
"The shoe's upper is made of a knit material, providing a snug fit without compromising comfort."
snug fit
knit material
"The shoe has a wider and more comfortable toe box, providing a better fit during runs."
width
comfort
fit
"The new warp knit upper allows for a more voluminous fit in the toe box, accommodating natural foot splay."
warp knit
voluminous fit
natural splay
"The shoe features a wider and more comfortable toe box compared to its predecessor."
fit
comfort
wider
"The shoe has a wider toe box compared to its predecessor, enhancing comfort."
wider toe box
comfortable fit
"The Ghost 16 has a roomy toe box, providing good flexibility for the toes."
toe box
flexibility
comfort
"The toe box of the Brooks Glycerin 21 is notably roomy and well-structured."
roomy
structured
wide
"The fit of both shoes is praised for allowing ample toe wiggle room, enhancing comfort during runs."
toe room
comfort
"The toe box in both shoes offers ample room, contributing to their overall comfort during runs."
spacious
comfortable fit
"The Brooks Glycerin 21 has a consistent and snug fit across different foot shapes."
fit
foot shape
security
"The updated upper design fits well for average width feet, avoiding excess material."
fit
upper
"The spacious toebox allows for natural foot movement and increased comfort."
fit
comfort
toebox
"The original upper is designed with more room in the toe box and midfoot, catering to runners with higher volume feet."
toe box
high volume
comfort
"The shoe fits true to size, accommodating a variety of foot shapes."
true to size
fit
accommodating
"The upper reworking allows for a more streamlined fit while maintaining breathability."
fit
upper
streamlined
"The shoe comes in a stealth fit version that offers a sock-like upper for better fit."
sock-like
fit
streamlined design
"The Brooks Glycerin 21 has a very accommodating fit, catering to different foot shapes and sizes."
accommodating
fit
foot shape
"The Glycerin 21 is more accommodating in fit, particularly around the midfoot and toes."
accommodating
midfoot
"The shoe fits great and generally disappears off the feet during runs."
fit
comfort
unobtrusive
"The adjusted fit is slightly wider than previous versions, catering to different foot shapes."
fit
wide
comfort
"The shoe offers a better fit with more room throughout the length of the shoe, making it more comfortable for wider feet."
fit
comfort
wide
roomy
"Despite being a wider shoe, the fit remains accommodating for various foot shapes."
wide fit
accommodating
"The shoes fit well, accommodating a wide foot size comfortably."
wide fit
comfort
"The shoe fits true to size and offers a roomy toe box, accommodating various foot shapes."
true to size
toe box
fit
"Fit is favorable in both shoes, with a good width that accommodates regular runners comfortably."
fit
accommodation
comfort
"Both shoes fit true to size and offer a wide toe box, making them suitable for slightly wider-footed runners."
true to size
wide toe box
comfort
"The wider toe box in the Brooks Glycerin 21 enhances comfort for runners with more foot volume."
toe box
comfort
fit
"The shoe comes with a wider fit which provides ample room in the forefoot area."
wide fit
forefoot
wiggle room
"The heel fit is stable, ensuring the foot remains locked in during runs."
heel_fit
stability
lockdown
"The added padding in the heel collar enhances fit by pushing the foot forward slightly."
heel_padding
fit
adjustment
"The engineered mesh upper contributes to breathability and keeps the shoe comfortable over time."
fit
upper
breathability
"The shoe offers a secure fit with an engineered warp-knit upper, enhancing breathability and comfort."
snug fit
breathable upper
comfort
"The shoe features a breathable engineered mesh upper made from recycled materials."
breathable
sustainability
fit
"The upper design allows for excellent breathability and a secure fit."
breathable
lightweight
secure fit
"The secure fit is helped by the effective lacing system that molds the upper around the foot for a personalized feel."
fit
lacing_system
customization
"The classic laces allow the user flexibility in tying techniques for a secure fit."
laces
adjustability
fit
"Reviewers enjoyed the classic Brooks fit, which is roomy in the toe box and snug in the midfoot and heel."
roomy toe box
secure heel
midfoot support
"The upper has a good fit, providing a secure and enjoyable experience."
fit
secure
predictable
"The fit of both shoes is true to size and offers a secure lock down."
fit
secure
lockdown
"Both shoes provide a secure fit with good heel hold, preventing any irritation during runs."
heel hold
forefoot room
"The fit of the Glycerin 21 has been optimized to provide a roomy toe box and great heel hold without any hot spots."
toe box
heel hold
no hot spots
"The shoe fits true to size and offers a roomy toe box, which is beneficial for runners with wider feet."
true to size
wide feet
comfort
"The shoe includes a variety of width options, ensuring a better fit for different foot shapes."
sizes
medium fit
wide fit
"The knitted upper improves fit, comfort, and security."
knitted upper
comfort
fit
"The shoe offers a snug but not restrictive fit, ideal for various foot shapes."
true to size
snug fit
comfort
"The fit of the shoe is true to size and accommodates different foot shapes."
true to size
accommodating
no tightness
"The Brooks Glycerin 21 offers a wide variety of fit options, including both medium and wide sizes."
fit options
wide fit
medium fit
"Both shoes maintain a consistent and reliable fit across various foot shapes and sizes."
true to size
reliable fit
"The Brooks Glycerin Max features a better heel design for comfort during runs."
heel design
stiffer heel counter
"The original version is praised for its superior lockdown compared to the stealth fit version, providing better security during runs."
lockdown
secure
better fit
"The shoe is designed to provide a snug, lock-down fit that enhances stability."
fit
lockdown
stability
"The upper features engineered warp mesh for both support and breathability."
breathability
support
fit
"The shoe provides a secure heel fit due to added stitching."
custom fit
heel support
"The Ghost 16 excels in providing a traditional and reliable fit that caters to everyday use."
traditional
everyday use
"Lacing system secures the foot effectively without causing discomfort, enhancing the overall fit."
lacing
foot lockdown
comfort
"The shoe provides a secure fit during runs."
secure fit
stability
"There is a notable contrast in fit between the two shoes, with the Ghost Max feeling slightly tighter and more secure."
snug fit
lockdown
secure
"The mesh material allows for good stretch and accommodates different foot sizes."
fit
mesh
width
"The shoe fits true to size and offers a wider feel."
true to size
width
stability
"The Ghost 16 is noticeably lighter than the Glycerin 21, enhancing versatility."
lightweight
versatile
"Both shoes provide a comfortable heel hold, although the Glycerin's heel is favored for its design."
heel hold
design
"The shoe is designed for a wide range of foot types with a neutral fit."
neutral
daily trainer
flexible fit
"The Glycerin 21 is noted for having a structured heel counter that enhances security and fit."
fit
heel counter
Brooks Glycerin 21
"The shoe maintains a comfortable and consistent fit without the need for break-in time."
easy fit
ready to go
"The shoe caters to different foot widths, offering standard and broader options for a better fit."
variety
custom fit
"The heel lock design in the Triumph 21 contributes to a secure fit, allowing users to run comfortably without sliding."
secure fit
comfort
"The shoe has a true-to-size fit, which is important for overall comfort."
true to size
fit
"The flexibility of the forefoot allows for a more comfortable run, particularly for those who dislike stiffness."
forefoot flexibility
comfort
running
Cons
"The upper structure caves in at the big toe under pressure."
big toe
upper structure
comfort
"The toe-box feels restrictive and may be uncomfortable for some runners."
toe-box
claustrophobic
"The toe-box may not accommodate high volume feet, potentially leading to discomfort."
high volume
toe-box
"The lack of a gusseted tongue may lead to reduced lockdown for some runners."
gusseted tongue
lockdown
personal preference
"The tongue on the Glyerin 21 lacks gusseting, which may affect the overall hold of the shoe."
tongue
fit
"The absence of a gusseted tongue may affect lock down for some runners."
gusseted tongue
lock down
fit
"There's no gusseted tongue which could affect security of fit."
tongue
security
"The heel counter height is perceived to be lower, which could affect fit for some runners."
heel counter
fit
optical illusion
"The 10mm drop encourages a heel strike, which may not be suitable for all runners."
heel strike
running form
drop preference
"The heel-to-forefoot drop may favor heel strikers, potentially impacting midfoot runners."
heel striker
midfoot
drop
"The cushioned upper makes it difficult to achieve a secure lockdown with the laces."
cushioned upper
lace security
tightening issues
"The lockdown of the stealth fit edition is not as strong compared to the original version."
lockdown
fit
"The shoe lacks a gusseted tongue, which can impact the fit."
fit
design
"The tongue design does not secure the foot properly for those with narrower feet."
fit
narrow feet
"Rubbing on the medial forefoot caused a small blister during a long run."
blister
medial forefoot
long run
"The length of the shoe may be slightly too long for some users, potentially affecting fit."
length
fit
sizing
"The shoe might feel short until the material breaks in."
fit
length
short
"The extra length in Glycerin 21 may be excessive for some."
excess length
toe box
"The heel padding may contribute to a feeling of being a bit short in fit."
fit
padding
"The fit is wider than in previous versions, which may not suit everyone."
fit
width
comparison
"The shoe has a narrow fit, which may not accommodate all foot shapes comfortably."
fit
narrow
"The shoe may feel narrower to some users compared to older models."
narrow fit
size adjustment
"Some runners may find the toe box too wide, which could result in fit issues for those with narrower feet."
wide toe box
narrow fit
fit issues
"The shoe might be too wide for individuals with narrow feet."
fit
width
"The upper fit has changed to be narrower and shorter, which might not suit all foot shapes."
size
toe box
"Fit may feel a bit too snug, especially for those with wider feet."
fit
narrow
"The fit is described as generous, which could cause issues for those needing a snugger structure."
generous
snug
"The previous versions of Glycerin were better suited to a different style of runner."
runner type
individual fit
"Fit consistency raises concerns for variability among different foot shapes."
standard fit
variability
"The toe box feels too spacious and may border on being baggy for some runners."
spacious
baggy
toe box
"The fit may not be ideal for those who prefer a snugger shoe."
fit
snug
size
"The snug fit of the stealth fit version may not be suitable for everyone."
snug
toe box
fit
"The shoe has a noticeable high drop which might not suit all runners."
drop
fit
height
"Heel slippage may occur due to design issues with the counter."
heel
slippage
lock
"The heel fit may feel overly tight for some runners."
heel fit
tightness
"The heel counter on the Ghost 16 is overly structured and causes irritation."
heel counter
Achilles irritation
structure
"Discrepancy in reported medial width adjustments compared to predecessors leads to uncertainty."
medial width
fit concerns
"The stealth fit upper is snug through the midfoot, which may not suit everyone."
fit
snug
upper
"There are no fit issues highlighted in the review."
"The fit of the toe box in the Ghost 16 is narrower compared to its Glycerin counterpart."
narrow
comfort
toe box
"The Ghost 16's toe box feels narrow and short compared to the Glycerin 21."
narrow toe box
short fit
"Some users may prefer a lighter shoe as this one falls in the middle weight category."
weight
balance
"The shoe does not offer flexibility required for varied running styles."
flexibility
fit issue
"The Glycerin 21 may feel too loose for some runners."
toe box
roominess
"The Nimbus 26 has a looser fit which might not provide an ideal lockdown for every runner."
fit
lockdown
"The Glycerin 21 may not feel as energetic or dynamic for some runners."
looseness
energy
"There is a potential mismatch in fitting between the Ghost 16 and Glycerin 21, risking discomfort on longer runs."
fit issues
comfort during runs
"The fit of the GEL Nimbus 26 may cause some bunching in the tongue area, which can be uncomfortable for some runners."
bunching
cinching
"Due to the high stack height, the Triumph 21's ride may feel tilted which can be an adjustment for some runners."
high stack
tilted ride
fit
"Some runners may have difficulty adjusting from the midsole of the Glycerin 21 which feels flatter compared to the Triumph 21."
transition
fit
tilted ride
"There could be improvements made to the lacing system for better midfoot wrapping."
gusseted tongue
midfoot wrapping
"Some users may experience heel slippage due to the fit being wider than expected."
heel slippage
fit issues

support (5)
flexibility (3)
platform (3)
transition (2)
heel counter (2)
lockdown (2)
rocker (2)
supportive (2)
Pros
"Transitions in the Glycerin 21 feel smooth and stable, contributing to a good running experience."
smooth transitions
stability
"The shoe is designed to be stable, maintaining a sturdy platform despite the plush cushioning."
stability
wide base
platform
"The shoe is recognized for its smooth and stable transitions during runs."
smooth
stable
"The shoe offers a smooth transition for heel strikers, thanks to its beveled heel design."
beveled heel
smooth transition
heel striking
"The outsole offers a broader platform which enhances stability with the increased stack height."
stability
outsole
stack height
"The shoe's stability is particularly advantageous for heel strikers, offering a reliable ride."
stability
heel
performance
"The comfortable fit, coupled with great stability, makes it a great choice for extensive runs."
stability
comfort
performance
"The Glycerin 21 offers a flexible ride, making it versatile for different types of runs."
flexibility
natural
performance
"Both shoes allow for a natural running experience due to their flexibility."
flexible
natural movement
stability
"The shoe maintains good flexibility, allowing for a more natural foot movement."
flexible
natural movement
comfort
"The shoe features a padded heel counter that enhances comfort and stability."
heel counter
comfort
stability
"The heel counter is designed for good fit and comfort, effectively holding the foot in place."
secure fit
stability
"The heel cup provides excellent stability, ensuring your foot is well supported during runs."
stability
heel_cup
support
"The GTS version provides mild anti-pronation support, making it versatile for both neutral and overpronating runners."
stability
guidance
anti_pronation
"The shoe remains predictable and stable over longer runs, providing support for heavier runners."
stability
weight
long runs
"The GTS 21 model offers additional support for those who need it."
support
GTS 21
"The Brooks Glycerin 21 offers a GTS version for additional support, beneficial for those with pronation issues."
GTS
support
pronenation
"There is also a GTS support version available, which features guide rails for natural stride support."
guide rails
support
stability
"The shoe holds the foot securely in place, providing a feeling of stability throughout the run."
foot secure
stability
"The shoe provides excellent lockdown support, adding to its overall comfort level."
support
secure fit
"Reviewers appreciated the stability provided by the shoe's wider base and supportive design."
stability
wider base
centered foot
"The shoe provides a stable and smooth transition due to its broad platform."
broad platform
stability
smooth transitions
"The broader platform of the shoe contributes to stability and smooth transitions."
broad platform
stability
smooth transitions
"Brooks Glycerin 21 has a wide platform which enhances stability during runs."
wide platform
stability
"The GTS version’s guide rail support system effectively aids runners needing extra stability."
support
stability
"The lower drop of the Brooks Ghost Max 2 contributes to a more stable running experience."
lower drop
stability
running experience
"The guide rail system helps with alignment for overpronators and supinators."
guide rails
overpronation
stability
"Overall stability during runs is noteworthy, making it suitable for various running styles."
stability
support
running style
"The shoes provide stability with protective rails on the sides."
stability
support
protective
"A 10mm offset is ideal for runners with various foot conditions."
10mm offset
Achilles support
calf support
"Both shoes feature effective rockers that aid in a natural running motion."
stability
rocker
natural motion
"The shoe is designed for neutral runners, providing support for long-distance runs."
support
long distance
"The shoe boasts a wide base providing inherent support which is beneficial for runners."
support
stability
wide
"The wide base contributes to stability and smooth transitions."
stability
transitions
"The updated Glycerin GTS 21 offers enhanced side wall support for increased stability during runs."
support
stability
heel
"The Glycerin 21 offers excellent heel support with a solid heel counter."
heel counter
support
"The Glycerin 21 features a slightly widened platform which enhances stability and comfort."
platform
stability
"Both models provide a stable ride, but the Glycerin 21 maintains stability while allowing for a more cushioned feel."
stability
consistent ride
"These running shoes offer great stability, perfect for uneven surfaces."
stability
support
trail
"The shoe provides natural support despite being categorized as neutral due to its construction."
neutral
support
flared midsole
"The shoe features a unique guide rail system that provides great stability during runs."
guide rails
unique
stability
Cons
"The shoe's heel stability is inadequate, especially for walking."
walking
stability
heel
"The midfoot side rails do not enhance stability noticeably for all runners."
stability
footing
"The shoe feels flat and lacks a prominent forefoot rocker for better transitions."
transitions
rocker
"Glycerin 21 lacks a noticeable rocker for smoother transitions."
transition
running dynamics
"Although the Glycerin 21 has a snug fit, some runners still feel a lack of stability."
fit
stability
"The heel counter is quite rigid, which could be uncomfortable for some runners."
rigidity
discomfort
"The heel counter of the stealth fit version is flexible, which might not provide enough support for some runners."
flexibility
support
heel
"The midsole stability is poorer compared to its predecessor, particularly for heavier runners."
heavy runners
gait types
"Some runners may experience discomfort due to the design of the anti-pronation support, which is less controlling than expected."
support
pronation
"There are some stability concerns for runners who need extra support."
stability
support
"The midsole's extra features like lateral side rails may be unnecessary for many users."
stability
unneeded
"The shoe might not provide enough support for runners needing extra stability."
stability
support
"While the shoe is designed for a broader platform, there is still some perceived wobble during runs."
midsole
wobble
stability
"The shoe's midsole feels unstable during runs, especially when fatigued."
instability
tired legs
midsole
"The shoe may require more testing to fully evaluate stability over longer distances."
long distance
instability
future evaluations
"Brooks shoes generally work better with a wider base for stability."
stability
width
"The heel-to-toe drop requires adjustment, potentially impacting running mechanics."
heel-to-toe drop
slanted feel
"The GTS model includes guide rails which may not be beneficial for neutral runners."
guide rails
neutral runner
"The Brooks Glycerin 21 may feel less stable compared to the Ghost Max 2 due to its design."
stability
base
"Some runners may find the guide rail system unnecessary or restrictive."
guide rail
support
"While the shoe is stable, it may not provide enough performance for highly demanding runs."
stability
running performance
"There is little difference in stability between the two models, which could be a disadvantage for those looking for improved features."
stability
similarity
"Despite being a stability shoe, the reviewer prefers the versatility of the Ghost Max."
preference
comparison
"The stability of the Ghost 16 could be negatively influenced by its heel design which may not suit all runners."
stability
heel issues
"The outsole has been segmented which may affect performance during runs."
outsole
performance
"The heel counter's flexibility may impact lockdown stability during runs."
heel counter
flexibility
lockdown
"Lockdown fit is just okay, not as secure as expected for a performance shoe."
lockdown
stability
fit
"The shoe's improved flexibility may not suit all runners, especially those who prefer a stiffer ride."
personal preference
stability
ride
"Some runners may prefer features provided by alternative models for stability."
stability
alternative model

durability (4)
traction (3)
outsole (3)
versatility (1)
weather (1)
wet surfaces (1)
wet performance (1)
improved grip (1)
Pros
"The RoadTack outsole enhances grip across various surfaces, making it versatile for different running conditions."
grip
outsole
durability
"The new RoadTack outsole enhances grip and durability for running on various surfaces."
enhanced grip
wet conditions
outsole durability
"The outsole has been upgraded with a new rubber and recycled silica, enhancing grip and durability."
outsole rubber
recycled materials
grip
"The rubber coverage in the outsole improves the overall grip and durability of the shoe, enhancing performance on different surfaces."
rubber coverage
performance
grip
"The outsole provides excellent grip in wet and slippery conditions."
grip
wet conditions
"The shoe has decent traction, suitable for various terrains."
outsole
traction
trail running
"The traction on the outsole has been improved, enhancing grip during runs."
outsole
traction
improvement
"The outsole utilizes RoadTack rubber for good grip in various wet conditions."
RoadTack
wet conditions
grip
"The Brooks Glycerin 21's grip supports stability while running."
traction
control
"The outsole features thick rubber, which prevents slipping and improves grip on various surfaces."
outsole
rubber
safety
"The road grip provided by the outsole is exceptional, especially in wet conditions."
traction
wet conditions
sticky
"The outsole provides excellent grip in a variety of conditions."
outsole
traction
various conditions
"The traction of the shoe is effective, improving performance on faster runs."
traction
performance
running
"The grip of the outsole is fantastic, providing confidence on varied terrains."
grip
traction
wet surfaces
"The Glycerin 21 has a wide platform with durable RoadTack rubber for good traction on wet roads."
wide base
durability
wet traction
"Both shoes offer excellent grip thanks to the same rubber and silica outsole."
outsole
grip
durability
"The segmented outsole design contributes positively to the shoe's ride and grip."
segmented
grip
"The shoes handle well on various surfaces, showcasing their versatility."
versatile
grip
varied surfaces
"The shoe is reliable in various weather conditions as well as different terrains."
weather
grip
versatile
"The rubber outsole provides excellent grip on wet surfaces."
excellent grip
reliable
outsole
"The grip of the Nimbus 26 is improved significantly and performs well in wet conditions."
grip
wet conditions
Nimbus 26
"The updated outsole on the Brooks Glycerin 21 enhances grip and protection during runs on varied surfaces."
outsole
protection
"Both shoes feature a generous amount of outsole coverage, contributing to their grip on wet roads."
outsole coverage
wet roads
"The outsole design of the Glycerin 21 allows for better foam compression and stability during runs."
outsole
grip
stability
Cons
"The traction on wet surfaces is average and not aggressive enough."
traction
wet
"The new outsole material may not perform as well on very wet surfaces compared to expectations."
outsole
wet surfaces
"The outsole provides limited grip on muddy or grassy surfaces."
mud
grip
outdoor
"The grip on extremely slick surfaces may be tested despite good performance in some conditions."
wet
cobblestones
grip
"The shoe's grip could be improved for better traction."
minimal
grip
performance
"No grip-related concerns are raised in the review."
"The flexibility of the outsole rubber may limit overall traction."
flexibility
outsole coverage
"The grip performance may not show significant changes, which could disappoint those seeking better traction."
grip
similarity

weight (7)
versatility (5)
sustainability (4)
aesthetics (3)
style (3)
temperature (3)
price (3)
cost (3)
Pros
"Overall, the Glycerin 21 is touted as a great everyday shoe for both running and walking."
daily use
running
walking
"The Brooks Glycerin 21 is versatile enough to also perform well as a walking shoe."
walking
daily use
versatile
"The shoe is versatile enough for both running and casual wear after use, maintaining its aesthetic appeal."
casual wear
after running life
aesthetics
"The Glycerin 21 is versatile for various types of runs and workouts."
versatile
training
event
"Both shoes are designed to be versatile enough for different activities, whether running or casual wear."
versatile
everyday use
casual wear
"The new version of the Glycerin is lighter, which enhances its overall usability."
lightweight
user-friendly
"The Glycerin 21 is impressively lightweight."
lightweight
"The shoe is considered fairly lightweight relative to its cushioning."
lightweight
cushion
"The Brooks Glycerin 21 and GTS 21 offer a light design, making them easy to wear."
lightweight
design
"The shoe's color options are noted to be inclusive and appealing."
color variety
appealing design
"The design and aesthetic of the stealth fit make it an appealing choice for lifestyle and casual wear."
lifestyle
aesthetic
style
"The shoe comes in fun and interesting color options, which adds to its appeal."
colorful
appealing
"The shoe maintains a consistent feel that runners can rely on year after year."
reliability
trust
brand
"This shoe is specifically designed for high mileage training, making it suitable for easy and recovery runs."
high mileage
training
recovery
"The shoe retains elements from previous models while implementing minor important improvements."
improvements
design
"Overall, the Brooks Glycerin 21 is considered a positive update that maintains a successful lineage."
positive update
success
"The Brooks Glycerin 21 is designed with a sleek appearance that combines style with eco-friendliness."
style
sustainability
design
"The shoes received a compliment from another gym-goer, indicating their aesthetic appeal."
appearance
aesthetic
"The Glycerin 21 has a stylish design with a significant improvement in aesthetics compared to earlier models."
design
style
"This shoe is created with a high percentage of recycled materials, reducing environmental impact."
recycled materials
environment
sustainability
"The Glycerin 21's upper is made of 60% recycled material, making it an environmentally friendly option."
eco-friendly
materials
environment
"Both shoes utilize environmentally friendly materials, with Brooks emphasizing recycled content."
recycled materials
environmental impact
sustainability
"The upper of the shoe is made with over 60% recycled materials, which is environmentally friendly."
recycled materials
environmental impact
"The design and thoughtful details of the shoe packaging add to the overall experience."
packaging
visual appeal
"The Brooks Glycerine 21 has improved aesthetics compared to previous models."
aesthetics
colorway
improvements
"Both shoes have excellent build quality with premium materials."
build quality
premium materials
durability
"The overall build quality of the Glycerin 21 is excellent, reflecting premium materials."
build quality
premium materials
"The shoe is recommended for its overall quality and performance."
quality
recommendation
Cons
"While running, the tongue of the shoe shifts to one side over time."
tongue
fit
alignment
"The shoelaces are of poor quality and tend to fray easily."
quality
fraying
"The shoe's weight could be a concern for runners looking for a lighter option."
weight
lightness
"The shoe is not the lightest option available."
weight
heavy
"The weight of the Brooks Glycerin 21 has increased slightly, which some might find unfavorable."
weight increase
heaviness
performance
"There are lighter alternatives available."
lightweight
comparison
"The shoe feels heavier than it appears, especially for larger sizes."
heaviness
comparison
"The overall weight of the shoe has increased compared to its predecessor."
weight
comparison
Glycerin 20 vs 21
"The increased stack height has added weight, which some runners may find undesirable."
stack height
weight
criticism
"The shoe tends to be slightly warm, which can be uncomfortable in hot conditions."
warmth
comfort
"The shoe is warmer in colder climates, making it potentially unsuitable for hot weather use."
warmth
climate
"There is a suggestion of potential temperature issues due to design."
design
heat
"The price has seen a minor increase, which may deter budget-conscious buyers."
cost
value
"The shoe's pricing may deter budget-conscious runners."
pricing
budget
"The shoe is quite expensive compared to previous models."
price
value
"The lack of reflective elements is a safety concern for low-light running conditions."
safety
reflectivity
"The price has increased compared to the previous edition."
pricing
value
"The shoe's high price point may deter potential buyers when compared to competitors with similar features."
price
competitors
"The price of the shoe is relatively high compared to the previous model which offers similar features."
expensive
price comparison
"The shoe feels heavier than expected despite weight loss from the previous model."
weight
performance
"Glycerin Max is heavier than Glycerin 21."
weight
comparison
"The original version is heavier, which may be a drawback for those seeking a lightweight running shoe."
heaviness
performance
"The styling of some color options is considered less appealing."
style
design
"The shoe is described as potentially boring in terms of color options."
color
design
"The shoe is not visually appealing and is described as somewhat boring."
appearance
design
"While consistent, some may find lack of innovative changes boring."
consistency
innovation
"The shoe's higher price point may be off-putting for some buyers."
expensive
value
"The price of the shoe is considered high and may not provide good value for all runners."
expensive
value
"The price difference between the models may not justify the upgrade for some runners."
price
comparison
"The price difference between the two shoes may lead to confusion regarding their perceived value."
price
value
confusion
"Limited design variety is offered with these shoes."
color
aesthetics
variety
"The shoe's aesthetics are lacking and may not appeal to all runners."
aesthetics
design
"The grip and traction may suffer due to the thick mesh upper retaining moisture."
wet grip
traction issues
"The shoe's cost does not justify its performance, especially when compared to other shoes."
price
performance
value
"The price difference may not justify the extra features of the Glycerin 21."
price
value
features

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Wear-tester reviews (59)

4.3/5

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