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Glycerin 21newer model: Glycerin 22
Model timeline
Men's cushioned running shoes
More about it ↓Should you buy it??
Not enough evidence yet
One source so far — no reviewer, buyer or press cross-check yet.
Quick take
In short: what each side says
Reviewers — each opened up in full further down ↓
Reviewers agree the Glycerin 21 is a plush, comfortable daily trainer with a softer, smoother ride than its predecessor, best suited for easy and long runs rather than speed work.
Quick read · who it’s for
Main competitors
Top rivals in Running Shoes.
About
What it is.
Glycerin 21 sits in Brooks's cushioned trainer lineup, built for everyday miles rather than speed sessions. It's positioned as a daily-mileage shoe: high cushion underfoot for easy runs, recovery days, and long slow distance, with the kind of no-surprises fit and ride runners expect from a long-running Brooks model.
It suits runners who want a dependable trainer they can put on and go, without researching a rotation of specialty shoes. Runners chasing a snappier, firmer feel for tempo runs or races, or anyone bothered by a stiffer heel counter, should look elsewhere in the lineup.
The verdict
The Brooks Glycerin 21 is a neutral running shoe made by Brooks. Released in 2023, it was designed in the United States. The shoe contains DNA Loft v2 foam in the midsole. Runners with joint pain buy it for cushioning and impact protection. AI assistants rank it third for running shoes addressing knee pain.
Act one
What the machines think.
Several AI models read the category and place this product — model by model, list by list, over time.
Rank trajectory?
Weeks of movement.
Act two · ★ new
What the people say.
The same product, judged by the owners who bought and filmed it — what they praise, what they knock, who it's for.
Video reviews?
What reviewers actually say.
AI summary of 5 reviews · as of Aug 2026
Reviewers agree the Glycerin 21 is a plush, comfortable daily trainer with a softer, smoother ride than its predecessor, best suited for easy and long runs rather than speed work.
What they praise
- Soft, plush cushioning that suits easy, recovery, and long runs
- Comfortable, secure upper with a padded heel collar and tongue
- Smoother, more refined ride than the previous version
- Durable rubber outsole with good grip, even on wet surfaces
- Surprisingly light for how substantial and cushioned the shoe looks
What they knock
- Not designed for speed work or uptempo running due to a firmer, less springy foam
- Some reviewers noted mild midsole instability at slower or tired paces
- Heel counter is stiff and may bother runners with certain Achilles sensitivities
- Tongue is not gusseted, leading to minor midfoot looseness for some
Who reviewers think this product is — and isn’t — for
For you if
Look elsewhere if
Synthesised from: kofuzi · The Run Testers · Doctors of Running · Flawless Physio | Shoe Reviews · Road Runner Sports
Brooks Glycerin 21
kofuzi
Brooks Glycerin 21 First Run Review: Early impressions on a cushioned shoe great
The Run Testers
Brooks Glycerin 21 Review: Matt’s Pair Looks So GOOD
Doctors of Running
Brooks Glycerin 21 Full Review by a Foot Specialist
Flawless Physio | Shoe Reviews
Brooks Glycerin 21 Review: A Surprisingly Light, Smooth, Durable Workhorse for Daily Running
Road Runner Sports
Find your situation?
Made for some — wrong for others.
Who reviewers think this product is — and isn’t — for
For you if
Look elsewhere if
You trust established brands with proven track records and broad consensus.
Brooks is a mature, trusted running brand; Glycerin 21 has deep reviewer agreement on its strengths and weaknesses, consistent fit, and settled product maturity.
You want a shoe that works straight out of the box with no fuss.
True-to-size fit, secure padded collar and tongue, reliable grip—minimal setup needed; only caveat is non-gusseted tongue may require lace-locking for narrower feet.
You want a solid daily trainer without overpaying for premium branding.
Mid-range street price ($130–160) with strong reviewer consensus on comfort and durability for easy miles; no premium markup, but Ghost 15 at $57 offers similar cushioning at a steeper discount.
You demand top-tier performance with no compromises in any area.
Praised for plush cushioning and durability, but reviewers note firm overall feel, less energy return than rivals, and instability under fatigue—clear quality gaps versus best-in-class. Consider Bondi 9.
You love gear that delights you with design, feel, or sensory appeal.
Reviewers praise the smooth, plush ride and lighter-than-it-looks feel, but the shoe is described as bulky and purely utilitarian—lacks the passionate design or aesthetic following of enthusiast…
Grounded in our buyer-review, reviewer-video, price and successor signals — a poor fit names a closer pick · as of Jul 13.
Frequently asked
What buyers want to know.
What is Brooks Glycerin 21 good for?
The Glycerin 21 is built for easy runs, recovery days, and long slow miles. Reviewers say it's a smooth, plush daily trainer with a soft, well-cushioned midsole that feels consistent and comfortable underfoot.
Who should buy the Brooks Glycerin 21?
It's best for runners who want high cushioning and comfort for low-intensity running. It's also a choice for runners with joint pain seeking impact protection.
Is the Brooks Glycerin 21 good for fast running or workouts?
No. Reviewers say it's not suited for faster paces, tempo work, or racing. It's strictly an easy-day shoe with a firm feel and less energy return than some rivals.
How does the fit of the Brooks Glycerin 21 compare to other Brooks shoes?
The shoe has a consistent, true-to-size fit across the Brooks lineup. Reviewers note it has a padded heel collar and tongue for comfort, though the tongue is not gusseted, so narrower feet may need a lace lock-down.
Are there any stability issues with the Brooks Glycerin 21?
Reviewers noted some wobble or instability under fatigued or ragged form. The shoe also has a firm feel overall, which reviewers are split on—some see it as smooth and stable, while others find it less springy than expected.
Does the Brooks Glycerin 21 perform well in wet conditions?
Yes. Reviewers report the durable outsole rubber provides reliable grip in wet conditions.
The recap
Where it stands today.
- Generation★Superseded by Glycerin 22 — the newer model in Brooks’s lineup.
- MakerBy Brooks — see how it ranks across other intents on its brand profile.