On
On Cloudultra Pro
Plated race shoe from On. Speed on runnable trail with Cloud tech.
PR Run scores
PR Run derived fit scores
100-miler readiness
Will this shoe survive a hundred-mile night? 32 mm stack, cushion 3/5
Descent tolerance
Does it save your toenails on long descents? 24 mm forefoot, heel counter 2/5
Swelling room
Room to grow when your feet swell? 26.2 mm toebox height
Grit resistance
Does dust stay outside the shoe? moderate BR breathability
Hot-day comfort
How well does it breathe in heat? Standard mesh
Achilles-friendly
Kind to a cranky achilles? 8 mm drop, heel counter 2/5
Full specs
Drop
8 mm
Heel stack
32 mm
Forefoot stack
24 mm
Weight
272 g
Lug depth
4 mm
Plate
Yes
Waterproof
No
Foam
Helion HF
Lab measurements
Fit intelligence
Toebox width
Narrow toebox (74.6 mm vs 96 mm median)
Toebox height
Slightly tall (26.2 mm vs 25 mm median)
True to size.
Fit numbers from the lab. Swell guidance: foot care.
In the review circuit
Questions before you race
Is the On Cloudultra Pro good for 100-mile races?
Solid. 32 mm stack, cushion 3/5. 100-miler readiness score 63/100.
Does the On Cloudultra Pro fit wide feet?
No. Toebox is 74.6 mm which is narrow. Look elsewhere if you need width.
What is the drop on the On Cloudultra Pro?
8 mm, with a 32 mm heel stack and 24 mm forefoot.
Is the On Cloudultra Pro plated?
Yes. Manufacturer confirms a plate is used. Race-day propulsion, less flex for slow trail.
Is the On Cloudultra Pro good on wet rock?
Traction coefficient of friction on wet lab surface: 0.65. Elite grip on wet rock.
Manufacturer specs · Retailer listing
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swellingRoom: 100/100 (Elite)
descentTolerance: 75/100 (Great)
gritIngressRisk: 55/100 (Solid)
hotFootScore: 36/100 (Passable)
achillesFriendlyScore: 70/100 (Great)
hundredMilerReadiness: 63/100 (Solid)