ShoesOnCloudhorizon Waterproof

On

On Cloudhorizon Waterproof

On Cloudhorizon Waterproof. 39.4mm stack, 339g. Retailer specs verified on Running Warehouse.

PR Run Verified
Soft trailsLong ultrasDaily training

PR Run scores

Grip2/5
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? 39.4 mm stack, cushion 5/5

100Elite

Descent tolerance

Does it save your toenails on long descents? 29.2 mm forefoot, heel counter 4/5

100Elite

Swelling room

Room to grow when your feet swell? 26.4 mm toebox height

100Elite

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

43Passable

Achilles-friendly

Kind to a cranky achilles? 10.2 mm drop, heel counter 4/5

Full specs

Drop

10.2 mm

Heel stack

39.4 mm

Forefoot stack

29.2 mm

Weight

339 g

Lug depth

2.3 mm

Plate

No

Waterproof

No

Lab measurements

MeasurementValue
Breathability1 BR
Flexibility28.5 N
Heel counter4/5
Energy return55.0 %
Shock absorption126 SA
Midsole softness50.1 HA
Softness in cold23 %
Outsole thickness2.1 mm
Tongue padding10.3 mm
Insole removableYes
Insole thickness5.3 mm
Reflective elementsYes

Lab numbers from RunRepeat. Sources.

Fit intelligence

Toebox width

Narrow toebox (70.4 mm vs 96 mm median)

Toebox height

Slightly tall (26.4 mm vs 25 mm median)

Runs small. Consider a half size up.

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

Questions before you race

Is the On Cloudhorizon Waterproof good for 100-mile races?

Elite. 39.4 mm stack, cushion 5/5. 100-miler readiness score 94/100.

Does the On Cloudhorizon Waterproof fit wide feet?

No. Toebox is 70.4 mm which is narrow. Look elsewhere if you need width.

What is the drop on the On Cloudhorizon Waterproof?

10.2 mm, with a 39.4 mm heel stack and 29.2 mm forefoot.

Is the On Cloudhorizon 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 Cloudhorizon Waterproof Review, Specs, and Fit (2026) | PR Run