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An innovative max-cushion daily trainer that blends high stack with flexible ground feel, earning a green light from the reviewers.
Best for: Daily training, easy runs, and long runs for runners wanting max cushion with more ground feel.
Road Daily Trainer
Brooks Glycerin Flex
Not a gimmick: a more neutral, more energetic and lighter take on the Glycerin that nudges it into long-run territory, better as a Glycerin supplement than a replacement. — Kofuzi
Physical blueprint
Where this shoe sits
Weight 264 g
Heel stack 38.0 mm
Drop 6.0 mm
Cushioning High
Best for
Daily Training
Pronation Neutral
Surface Road
Specifications
Weight (M9)
264g (9.3 oz)
Stack (Heel)
38.0 mm
Stack (Forefoot)
32.0 mm
Drop
6.0 mm
Midsole
DNA Tuned (nitrogen-infused EVA)
Outsole
Segmented rubber outsole
Upper
Engineered flat knit
Lacing
Traditional
Fit Profile
Length
True To Size
Forefoot Width
Narrow
Midfoot Width
Average
Heel Width
Average
Lockdown
Good
Toe Box
Average
Sizing
True To Size
Ride Characteristics
Cushioning
High
Stability
Neutral
Durability
Outsole
Above Average
Expert reviews
DO
Best for: Runners who want forefoot flex and have good big-toe joint mobility in a maximally stacked shoe
+1 earlier review from Doctors of Running
An interesting niche shoe — high stack with unusual flexibility through midfoot and forefoot. Best for neutral runners who want flexibility with cushion; the upper runs warm and the lateral flex groove can cause hot spots.
Best for: Niche neutral runners who specifically want a high-stack but very flexible daily trainer
FR
At GBP 165 the Glycerin Flex's decoupled forefoot gimmick doesn't deliver a distinctive natural feel or the comfort the Glycerin line is known for, and the reviewer can't identify who it's meant for. Applauds Brooks for innovating but cannot recommend this version.
Best for: Unclear target runner; reviewer could not identify who this shoe suits
K
Kofuzi calls the Glycerin Flex the most exciting shoe Brooks has released this year, praising its ability to deliver both cushioned easy running and tempo-capable bounce in a single shoe — exactly what he hoped the Hyperion Max 4 would be.
+2 earlier reviews from Kofuzi
Not a gimmick: a more neutral, more energetic and lighter take on the Glycerin that nudges it into long-run territory, better as a Glycerin supplement than a replacement.
Best for: Longtime Glycerin fans who want a lighter, more nimble, more uptempo version of the Glycerin for long runs with some faster miles.
RM
A genuinely unique max-cushion trainer with a traditional drop and flexible midsole; didn't jive with the reviewer's supinating gait but may work for more neutral runners seeking flexibility.
Best for: Neutral runners wanting a cushioned but freely flexing trainer that can double for gym work.
TR
Lighter than the Glycerin 23 with a genuinely more natural flex feel, but the difference is subtle and the upper and midfoot fit are worse — hard to justify over the Glycerin 23 unless the flex design really resonates on a try-on.
Best for: Runners who specifically want a more natural, flexible underfoot feel in a plush daily cushion shoe.
+1 earlier review from The Run Testers
A solid, comfortable cushioned daily from Brooks whose flex-groove concept is interesting but subtle on the run; reliable for easy miles and long runs but not especially versatile, exciting, or dramatically different from other Brooks cushion dailies.
Best for: Easy daily miles, long runs and recovery runs for runners who want cushioned protection with a flexible, natural feel rather than an aggressive rocker.
Frequently asked questions
How does the Brooks Glycerin Flex fit?
Reviewers note: True to size with a comfortable knit upper; only available in standard width (unlike the regular Glycerin which comes in wide and extra wide).
Per Kofuzi.
How much does the Brooks Glycerin Flex weigh and what is its drop?
The Brooks Glycerin Flex weighs about 264g (men's 9), has a 38.0mm heel stack and a 6.0mm heel-toe drop.
What shoes is the Brooks Glycerin Flex compared to?
Reviewers compare the Brooks Glycerin Flex to Brooks Glycerin 22, ASICS Nimbus 28, On Cloud Monster Hyper, Brooks Glycerin 23.
Per Kofuzi, The Run Testers, Run Moore, FORDY RUNS.
How many experts have reviewed the Brooks Glycerin Flex?
Next Pair aggregates 10 expert reviews of the Brooks Glycerin Flex, including Kofuzi, The Run Testers, Doctors of Running.
Per Kofuzi, The Run Testers, Doctors of Running.
Where it sits among similar shoes
Compared to other road daily trainer in the same lane.
Weight · lower = lighter
Brooks Glycerin Flex 264g
ASICS Superblast 2 249g
Saucony Endorphin Azura 244g
Adidas Supernova Rise 3 264g
Heel stack · higher = more cushioning
Brooks Glycerin Flex 38.0mm
ASICS Superblast 2 46.0mm
Saucony Endorphin Azura 41.0mm
Adidas Supernova Rise 3 36.0mm
Drop · higher = more heel-leaning
Brooks Glycerin Flex 6.0mm
ASICS Superblast 2 8.0mm
Saucony Endorphin Azura 8.0mm
Adidas Supernova Rise 3 8.0mm
Continue reading
Foam guide
How Supercritical foams foam works
Methodology. Specs come from manufacturer data and
authoritative third-party catalogs. Reviewer verdicts are summarized
from named, linked sources — never copied verbatim. We weight clinical
and lab-tested sources more heavily than community commentary, but the
specific weights stay internal. Never sponsored, never paid placement.
Last updated 2026-06-19