On
On Cloudboom Echo 3
On Cloudboom Echo 3. 38.6mm stack, 225g. 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? 38.6 mm stack, cushion 5/5
Descent tolerance
Does it save your toenails on long descents? 28.4 mm forefoot, heel counter 2/5
Swelling room
Room to grow when your feet swell? 27.0 mm toebox height
Grit resistance
Does dust stay outside the shoe? 5 BR breathability
Hot-day comfort
How well does it breathe in heat? 5 BR / ?% drying
Achilles-friendly
Kind to a cranky achilles? 10.2 mm drop, heel counter 2/5
Full specs
Drop
10.2 mm
Heel stack
38.6 mm
Forefoot stack
28.4 mm
Weight
225 g
Plate
No
Waterproof
No
Lab measurements
Fit intelligence
Toebox width
Narrow toebox (70.4 mm vs 96 mm median)
Toebox height
Slightly tall (27.0 mm vs 25 mm median)
True to size.
Fit numbers from the lab. Swell guidance: foot care.
Questions before you race
Is the On Cloudboom Echo 3 good for 100-mile races?
Great. 38.6 mm stack, cushion 5/5. 100-miler readiness score 79/100.
Does the On Cloudboom Echo 3 fit wide feet?
No. Toebox is 70.4 mm which is narrow. Look elsewhere if you need width.
What is the drop on the On Cloudboom Echo 3?
10.2 mm, with a 38.6 mm heel stack and 28.4 mm forefoot.
Is the On Cloudboom Echo 3 good on wet rock?
Traction coefficient of friction on wet lab surface: 0.38. Marginal grip on wet rock.
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swellingRoom: 100/100 (Elite)
descentTolerance: 93/100 (Elite)
gritIngressRisk: 72/100 (Great)
hotFootScore: 24/100 (Weak)
achillesFriendlyScore: 59/100 (Solid)
hundredMilerReadiness: 79/100 (Great)