On
On Cloudflyer 4
On Cloudflyer 4. 33.3mm stack, 308g. 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? 33.3 mm stack, cushion 4/5
Descent tolerance
Does it save your toenails on long descents? 23.5 mm forefoot stack
Swelling room
Room to grow when your feet swell? 33.3 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? 9.8 mm drop, heel counter 3/5
Full specs
Drop
9.8 mm
Heel stack
33.3 mm
Forefoot stack
23.5 mm
Weight
308 g
Plate
No
Waterproof
No
Lab measurements
Fit intelligence
Runs small. Consider a half size up.
Fit numbers from the lab. Swell guidance: foot care.
Questions before you race
Is the On Cloudflyer 4 good for 100-mile races?
Elite. 33.3 mm stack, cushion 4/5. 100-miler readiness score 83/100.
Does the On Cloudflyer 4 fit wide feet?
Toebox width has not been measured in the lab yet.
What is the drop on the On Cloudflyer 4?
9.8 mm, with a 33.3 mm heel stack and 23.5 mm forefoot.
Is the On Cloudflyer 4 good on wet rock?
Lab traction has not been measured for this model yet.
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swellingRoom: 66/100 (Great)
descentTolerance: 55/100 (Solid)
gritIngressRisk: 100/100 (Elite)
hotFootScore: 23/100 (Weak)
achillesFriendlyScore: 53/100 (Solid)
hundredMilerReadiness: 83/100 (Elite)