On
On Cloud X
On Cloud X. 27.9mm stack, 240g. Retailer specs verified on Running Warehouse.
PR Run scores
PR Run derived fit scores
100-miler readiness
Will this shoe survive a hundred-mile night? 27.9 mm stack, cushion 3/5
Descent tolerance
Does it save your toenails on long descents? 17.8 mm forefoot stack
Swelling room
Room to grow when your feet swell? 27.9 mm heel stack
Grit resistance
Does dust stay outside the shoe? 4 BR breathability
Hot-day comfort
How well does it breathe in heat? 4 BR / ?% drying
Achilles-friendly
Kind to a cranky achilles? 10.1 mm drop, heel counter 2/5
Full specs
Drop
10.1 mm
Heel stack
27.9 mm
Forefoot stack
17.8 mm
Weight
240 g
Plate
No
Waterproof
No
Lab measurements
Fit intelligence
True to size.
Fit numbers from the lab. Swell guidance: foot care.
Questions before you race
Is the On Cloud X good for 100-mile races?
Passable. 27.9 mm stack, cushion 3/5. 100-miler readiness score 47/100.
Does the On Cloud X fit wide feet?
Toebox width has not been measured in the lab yet.
What is the drop on the On Cloud X?
10.1 mm, with a 27.9 mm heel stack and 17.8 mm forefoot.
Is the On Cloud X good on wet rock?
Traction coefficient of friction on wet lab surface: 0.43. Marginal grip on wet rock.
Manufacturer specs · Retailer listing
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swellingRoom: 50/100 (Solid)
descentTolerance: 29/100 (Weak)
gritIngressRisk: 84/100 (Elite)
hotFootScore: 23/100 (Weak)
achillesFriendlyScore: 60/100 (Solid)
hundredMilerReadiness: 47/100 (Passable)