On
On Cloudmonster Void
On Cloudmonster Void. 35.9mm stack, 289g. 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? 35.9 mm stack, cushion 5/5
Descent tolerance
Does it save your toenails on long descents? 25.1 mm forefoot, heel counter 3/5
Swelling room
Room to grow when your feet swell? 23.3 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? 10.8 mm drop, heel counter 3/5
Full specs
Drop
10.8 mm
Heel stack
35.9 mm
Forefoot stack
25.1 mm
Weight
289 g
Plate
No
Waterproof
No
Lab measurements
| Measurement | Value |
|---|---|
| Traction (CoF) | 0.62 |
| Breathability | 4 BR |
| Flexibility | 13.6 N |
| Torsional rigidity | 16.50 Nm |
| Heel counter | 3/5 |
| Energy return | 55.5 % |
| Shock absorption | 129 SA |
| Midsole softness | 50.3 HA |
| Outsole thickness | 3.3 mm |
| Tongue padding | 3.1 mm |
| Insole removable | Yes |
| Insole thickness | 4.3 mm |
| Reflective elements | Yes |
Fit intelligence
Toebox width
Narrow toebox (74.1 mm vs 96 mm median)
Toebox height
Slightly shallow (23.3 mm vs 25 mm median)
True to size.
Fit numbers from the lab. Swell guidance: foot care.
Questions before you race
Is the On Cloudmonster Void good for 100-mile races?
Elite. 35.9 mm stack, cushion 5/5. 100-miler readiness score 84/100.
Does the On Cloudmonster Void fit wide feet?
No. Toebox is 74.1 mm which is narrow. Look elsewhere if you need width.
What is the drop on the On Cloudmonster Void?
10.8 mm, with a 35.9 mm heel stack and 25.1 mm forefoot.
Is the On Cloudmonster Void good on wet rock?
Traction coefficient of friction on wet lab surface: 0.62. Elite grip on wet rock.
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swellingRoom: 92/100 (Elite)
descentTolerance: 67/100 (Great)
gritIngressRisk: 76/100 (Great)
hotFootScore: 23/100 (Weak)
achillesFriendlyScore: 48/100 (Passable)
hundredMilerReadiness: 84/100 (Elite)