On
On Cloudflow 4 0
On Cloudflow 4 0. 36.1mm stack, 245g. 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? 36.1 mm stack, cushion 5/5
Descent tolerance
Does it save your toenails on long descents? 28.2 mm forefoot, heel counter 2/5
Swelling room
Room to grow when your feet swell? 25.3 mm toebox height
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? 7.9 mm drop, heel counter 2/5
Full specs
Drop
7.9 mm
Heel stack
36.1 mm
Forefoot stack
28.2 mm
Weight
245 g
Plate
No
Waterproof
No
Lab measurements
Fit intelligence
Toebox width
Narrow toebox (73.9 mm vs 96 mm median)
Toebox height
Category-average height (25.3 mm vs 25 mm median)
True to size.
Fit numbers from the lab. Swell guidance: foot care.
Questions before you race
Is the On Cloudflow 4 0 good for 100-mile races?
Great. 36.1 mm stack, cushion 5/5. 100-miler readiness score 79/100.
Does the On Cloudflow 4 0 fit wide feet?
No. Toebox is 73.9 mm which is narrow. Look elsewhere if you need width.
What is the drop on the On Cloudflow 4 0?
7.9 mm, with a 36.1 mm heel stack and 28.2 mm forefoot.
Is the On Cloudflow 4 0 good on wet rock?
Traction coefficient of friction on wet lab surface: 0.41. Marginal grip on wet rock.
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swellingRoom: 100/100 (Elite)
descentTolerance: 82/100 (Elite)
gritIngressRisk: 74/100 (Great)
hotFootScore: 23/100 (Weak)
achillesFriendlyScore: 71/100 (Great)
hundredMilerReadiness: 79/100 (Great)