ShoesBrooksGlycerin GTS 20

Brooks

Brooks Glycerin GTS 20

Brooks Glycerin GTS 20. 36.5mm stack, 309g. Retailer specs verified on Running Warehouse.

PR Run Verified
Soft trailsLong ultrasDaily training

PR Run scores

Grip3/5
Cushion5/5
Protection3/5
Durability4/5
Versatility3/5

PR Run derived fit scores

89Elite

100-miler readiness

Will this shoe survive a hundred-mile night? 36.5 mm stack, cushion 5/5

61Solid

Descent tolerance

Does it save your toenails on long descents? 25.5 mm forefoot stack

76Great

Swelling room

Room to grow when your feet swell? 36.5 mm heel stack

100Elite

Grit resistance

Does dust stay outside the shoe? 4 BR breathability

23Weak

Hot-day comfort

How well does it breathe in heat? 4 BR / ?% drying

31Weak

Achilles-friendly

Kind to a cranky achilles? 11 mm drop, heel counter 5/5

Full specs

Drop

11 mm

Heel stack

36.5 mm

Forefoot stack

25.5 mm

Weight

309 g

Plate

No

Waterproof

No

Lab measurements

MeasurementValue
Breathability4 BR
Heel counter5/5
Outsole thickness3.3 mm
Tongue padding9.9 mm
Insole removableYes
Insole thickness5.0 mm
Reflective elementsNo

Lab numbers from RunRepeat. Sources.

Fit intelligence

True to size.

Fit numbers from the lab. Swell guidance: foot care.

Questions before you race

Is the Brooks Glycerin GTS 20 good for 100-mile races?

Elite. 36.5 mm stack, cushion 5/5. 100-miler readiness score 89/100.

Does the Brooks Glycerin GTS 20 fit wide feet?

Toebox width has not been measured in the lab yet.

What is the drop on the Brooks Glycerin GTS 20?

11 mm, with a 36.5 mm heel stack and 25.5 mm forefoot.

Is the Brooks Glycerin GTS 20 good on wet rock?

Lab traction has not been measured for this model yet.

Manufacturer specs

New lab data on soft trails shoes, once a month.

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Image: Brooks product photo

Specs: manufacturer. Verified Sep 4, 2026.

Report inaccurate data: hi@pr.run. Data sources.

Brooks Glycerin GTS 20 Review, Specs, and Fit (2026) | PR Run