Brooks
Brooks Glycerin GTS 21
Brooks Glycerin GTS 21. 37.2mm stack, 301g. Retailer specs verified on Running Warehouse.
PR Run scores
PR Run derived fit scores
100-miler readiness
Will this shoe survive a hundred-mile night? 37.2 mm stack, cushion 5/5
Descent tolerance
Does it save your toenails on long descents? 26.5 mm forefoot, heel counter 5/5
Swelling room
Room to grow when your feet swell? 26.8 mm toebox height
Grit resistance
Does dust stay outside the shoe? 3 BR breathability
Hot-day comfort
How well does it breathe in heat? 3 BR / ?% drying
Achilles-friendly
Kind to a cranky achilles? 10.7 mm drop, heel counter 5/5
Full specs
Drop
10.7 mm
Heel stack
37.2 mm
Forefoot stack
26.5 mm
Weight
301 g
Plate
No
Waterproof
No
Lab measurements
Fit intelligence
Toebox width
Narrow toebox (74.0 mm vs 96 mm median)
Toebox height
Slightly tall (26.8 mm vs 25 mm median)
True to size.
Fit numbers from the lab. Swell guidance: foot care.
Questions before you race
Is the Brooks Glycerin GTS 21 good for 100-mile races?
Elite. 37.2 mm stack, cushion 5/5. 100-miler readiness score 89/100.
Does the Brooks Glycerin GTS 21 fit wide feet?
No. Toebox is 74.0 mm which is narrow. Look elsewhere if you need width.
What is the drop on the Brooks Glycerin GTS 21?
10.7 mm, with a 37.2 mm heel stack and 26.5 mm forefoot.
Is the Brooks Glycerin GTS 21 good on wet rock?
Traction coefficient of friction on wet lab surface: 0.36. Marginal grip on wet rock.
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swellingRoom: 100/100 (Elite)
descentTolerance: 100/100 (Elite)
gritIngressRisk: 100/100 (Elite)
hotFootScore: 22/100 (Weak)
achillesFriendlyScore: 33/100 (Weak)
hundredMilerReadiness: 89/100 (Elite)