Fashion & Footwear › Running Shoes
Glycerin GTS 21
Model timeline
Cushioned stability running shoes
Budget · bottom third of running shoes
Quick take
In short: what each side says
AI panel · Buyers — each opened up in full further down ↓
Gemini ranks this product at #20.0 on average
Owners love the comfort, cushioning, and stability for daily wear and running, with strong repeat-purchase loyalty, but durability concerns emerge around creasing and long-term wear.
The juries split — Divided. Check both sides before you commit.
Main competitors
Top rivals in Running Shoes.
The verdict
What the panel makes of it.
The Brooks Glycerin GTS 21 ranks sixth among AI recommendations for knee pain relief, and buyers largely agree, praising its cushioning and stability in 4.8/5 ratings, though durability issues with creasing suggest it may not hold up as well over extended use.
Act one
What the machines think.
Several AI models read the category and place this product — model by model, list by list, over time.
Model by model?
How each AI sees it.
Gemini ranks this product at #20.0 on average Averaging across the AI panel, Glycerin GTS 21 sits around #20.0 this snapshot.
Grok
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Didn’t rank Glycerin GTS 21 this snapshot.
GPT
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Didn’t rank Glycerin GTS 21 this snapshot.
Perplexity
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Didn’t rank Glycerin GTS 21 this snapshot.
AI Mode
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Didn’t rank Glycerin GTS 21 this snapshot.
Claude
Didn’t rank Glycerin GTS 21 this snapshot.
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.
What buyers say?
What Google knows about it.
Beyond the video critics, Google pools 312 buyer ratings of the Glycerin GTS 21 from across retailers — a far wider, if blunter, jury. Here’s the shape of that opinion.
312 ratings · 7 written
across 5 retailers
What owners single out
Review 1's durability issue (toe creasing after 5 months) aligns with the weakest aspect buyers identified in their feedback.
In their words
“I've been wearing Brooks shoes for some time as they were recommended by my P/T for my gait and knee issues. I use this shoe for my daily walks and it's an excellent alternative to the Adreneline 23 which was my previous shoe. The Glycerin GTS 21 adds comfort and cushioning but still has that unmistakable Brooks stability. Very happy with this purchase.”
Mike W. · verified purchase · roadrunnersports.com
“I absolutely love the look and feel of these shoes. When I tried them on for the 1st time, I was sold. Walked around the store for about 5 minutes and never took them off. Needed extra support in shoes due to recent hip surgery and plantar fasciitus (spelling might be wrong:) ). These have been great.”
Adam · verified purchase · REI
as of June 22 · 312 buyer ratings?
Frequent rivals?
What it competes against.
- Pegasus 42NikeBrooks leads 1–0 · 1 sharedRead
- Ghost 17BrooksGlycerin GTS 21 leads 1–0 · 1 shared~$101Read
- Fresh Foam X More v6New BalanceBrooks leads 1–0 · 1 sharedRead
- Ride 18SauconyBrooks leads 1–0 · 1 sharedRead
- Bondi 9HokaBrooks leads 1–0 · 1 shared~$174.99Read
- Clifton 10HokaBrooks leads 1–0 · 1 shared$124–$155Read
- 990v6New BalanceBrooks leads 1–0 · 1 sharedRead
The recap
Where it stands today.
- PositionBest rank #20 across 1 intent tracked (slipped 6 this week).
- FootprintStrongest in Best Running Shoes for Flat Feet (#20).
- TraitsMost often described as “premium cushioning”.
- Closest rivalPegasus 42 (1–0 across 1 shared intent).
- MakerBy Brooks — see how it ranks across other intents on its brand profile.
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