On
On Cloudultra 3
On's trail flagship. Missiongrip outsole, enough stack for ultras.
PR Run scores
PR Run derived fit scores
100-miler readiness
Will this shoe survive a hundred-mile night? 30 mm stack, cushion 4/5
Descent tolerance
Does it save your toenails on long descents? 22 mm forefoot, heel counter 2/5
Swelling room
Room to grow when your feet swell? 29.0 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
30 mm
Forefoot stack
22 mm
Weight
298 g
Lug depth
4 mm
Plate
No
Waterproof
No
Foam
Helion
Lab measurements
Fit intelligence
Toebox width
Narrow toebox (72.4 mm vs 96 mm median)
Toebox height
Tall toebox (29.0 mm vs 25 mm median)
Fit intel pending.
Fit numbers from the lab. Swell guidance: foot care.
In the review circuit
Questions before you race
Is the On Cloudultra 3 good for 100-mile races?
Great. 30 mm stack, cushion 4/5. 100-miler readiness score 79/100.
Does the On Cloudultra 3 fit wide feet?
No. Toebox is 72.4 mm which is narrow. Look elsewhere if you need width.
What is the drop on the On Cloudultra 3?
8 mm, with a 30 mm heel stack and 22 mm forefoot.
Is the On Cloudultra 3 good on wet rock?
Traction coefficient of friction on wet lab surface: 0.56. Elite grip on wet rock.
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swellingRoom: 100/100 (Elite)
descentTolerance: 86/100 (Elite)
gritIngressRisk: 55/100 (Solid)
hotFootScore: 48/100 (Passable)
achillesFriendlyScore: 70/100 (Great)
hundredMilerReadiness: 79/100 (Great)