Nike
Nike Infinityrn 4
Nike Infinityrn 4. 34.2mm stack, 316g. 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? 34.2 mm stack, cushion 5/5
Descent tolerance
Does it save your toenails on long descents? 24.4 mm forefoot, heel counter 2/5
Swelling room
Room to grow when your feet swell? 22.4 mm toebox height
Grit resistance
Does dust stay outside the shoe? 3 BR breathability
Hot-day comfort
How well does it breathe in heat? 3 BR / ?% drying
Achilles-friendly
Kind to a cranky achilles? 9.8 mm drop, heel counter 2/5
Full specs
Drop
9.8 mm
Heel stack
34.2 mm
Forefoot stack
24.4 mm
Weight
316 g
Plate
No
Waterproof
No
Lab measurements
Fit intelligence
Toebox width
Narrow toebox (74.1 mm vs 96 mm median)
Toebox height
Slightly shallow (22.4 mm vs 25 mm median)
Runs small. Consider a half size up.
Fit numbers from the lab. Swell guidance: foot care.
Questions before you race
Is the Nike Infinityrn 4 good for 100-mile races?
Elite. 34.2 mm stack, cushion 5/5. 100-miler readiness score 89/100.
Does the Nike Infinityrn 4 fit wide feet?
No. Toebox is 74.1 mm which is narrow. Look elsewhere if you need width.
What is the drop on the Nike Infinityrn 4?
9.8 mm, with a 34.2 mm heel stack and 24.4 mm forefoot.
Is the Nike Infinityrn 4 good on wet rock?
Traction coefficient of friction on wet lab surface: 0.43. Marginal grip on wet rock.
New lab data on soft trails shoes, once a month.
You will get one email per month with new lab data on soft trails shoes. No hype. Unsubscribe in one click.
swellingRoom: 80/100 (Elite)
descentTolerance: 54/100 (Solid)
gritIngressRisk: 87/100 (Elite)
hotFootScore: 22/100 (Weak)
achillesFriendlyScore: 61/100 (Solid)
hundredMilerReadiness: 89/100 (Elite)