ShoesOnCloudrunner 2 Waterproof

On

On Cloudrunner 2 Waterproof

On Cloudrunner 2 Waterproof. 35.8mm stack, 323g. Retailer specs verified on Running Warehouse.

PR Run Verified
Soft trailsLong ultrasDaily training

PR Run scores

Grip3/5
Cushion5/5
Protection4/5
Durability4/5
Versatility3/5

PR Run derived fit scores

94Elite

100-miler readiness

Will this shoe survive a hundred-mile night? 35.8 mm stack, cushion 5/5

99Elite

Descent tolerance

Does it save your toenails on long descents? 27.5 mm forefoot, heel counter 5/5

100Elite

Swelling room

Room to grow when your feet swell? 25.4 mm toebox height

97Elite

Grit resistance

Does dust stay outside the shoe? 1 BR breathability

21Weak

Hot-day comfort

How well does it breathe in heat? 1 BR / ?% drying

45Passable

Achilles-friendly

Kind to a cranky achilles? 8.3 mm drop, heel counter 5/5

Full specs

Drop

8.3 mm

Heel stack

35.8 mm

Forefoot stack

27.5 mm

Weight

323 g

Plate

No

Waterproof

No

Lab measurements

MeasurementValue
Breathability1 BR
Heel counter5/5
Outsole thickness3.0 mm
Tongue padding8.0 mm
Insole removableYes
Insole thickness4.2 mm
Reflective elementsYes

Lab numbers from RunRepeat. Sources.

Fit intelligence

Toebox width

Narrow toebox (71.0 mm vs 96 mm median)

Toebox height

Category-average height (25.4 mm vs 25 mm median)

True to size.

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

Questions before you race

Is the On Cloudrunner 2 Waterproof good for 100-mile races?

Elite. 35.8 mm stack, cushion 5/5. 100-miler readiness score 94/100.

Does the On Cloudrunner 2 Waterproof fit wide feet?

No. Toebox is 71.0 mm which is narrow. Look elsewhere if you need width.

What is the drop on the On Cloudrunner 2 Waterproof?

8.3 mm, with a 35.8 mm heel stack and 27.5 mm forefoot.

Is the On Cloudrunner 2 Waterproof 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: On product photo

Specs: manufacturer. Verified Sep 4, 2026.

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

On Cloudrunner 2 Waterproof Review, Specs, and Fit (2026) | PR Run