ShoesTopo AthleticAtmos

Topo Athletic

Topo Athletic Atmos

Topo Athletic Atmos. 37.8mm stack, 275g. Retailer specs verified on Running Warehouse.

PR Run Verified
Soft trailsLong ultrasDaily training

PR Run scores

Grip3/5
Cushion5/5
Protection2/5
Durability3/5
Versatility3/5

PR Run derived fit scores

79Great

100-miler readiness

Will this shoe survive a hundred-mile night? 37.8 mm stack, cushion 5/5

100Elite

Descent tolerance

Does it save your toenails on long descents? 32.5 mm forefoot, heel counter 4/5

100Elite

Swelling room

Room to grow when your feet swell? 29.8 mm toebox height

90Elite

Grit resistance

Does dust stay outside the shoe? 3 BR breathability

22Weak

Hot-day comfort

How well does it breathe in heat? 3 BR / ?% drying

68Great

Achilles-friendly

Kind to a cranky achilles? 5.3 mm drop, heel counter 4/5

Full specs

Drop

5.3 mm

Heel stack

37.8 mm

Forefoot stack

32.5 mm

Weight

275 g

Plate

No

Waterproof

No

Lab measurements

MeasurementValue
Traction (CoF)0.39
Breathability3 BR
Flexibility15.1 N
Heel counter4/5
Energy return48.3 %
Shock absorption130 SA
Midsole softness40.0 HA
Outsole thickness3.4 mm
Tongue padding6.5 mm
Insole removableYes
Insole thickness4.1 mm
Reflective elementsNo

Lab numbers from RunRepeat. Sources.

Fit intelligence

Toebox width

Narrow toebox (85.0 mm vs 96 mm median)

Toebox height

Tall toebox (29.8 mm vs 25 mm median)

True to size.

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

Questions before you race

Is the Topo Athletic Atmos good for 100-mile races?

Great. 37.8 mm stack, cushion 5/5. 100-miler readiness score 79/100.

Does the Topo Athletic Atmos fit wide feet?

No. Toebox is 85.0 mm which is narrow. Look elsewhere if you need width.

What is the drop on the Topo Athletic Atmos?

5.3 mm, with a 37.8 mm heel stack and 32.5 mm forefoot.

Is the Topo Athletic Atmos good on wet rock?

Traction coefficient of friction on wet lab surface: 0.39. Marginal grip on wet rock.

Manufacturer specs · Retailer listing

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Image: Running Warehouse product photo

Specs: manufacturer. Verified Sep 4, 2026.

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

Topo Athletic Atmos Review, Specs, and Fit (2026) | PR Run