Nike
Nike Ultrafly
Nike Ultrafly. 36.6mm stack, 299g. 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? 36.6 mm stack, cushion 5/5
Descent tolerance
Does it save your toenails on long descents? 24.8 mm forefoot, heel counter 3/5
Swelling room
Room to grow when your feet swell? 24.5 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? 11.8 mm drop, heel counter 3/5
Full specs
Drop
11.8 mm
Heel stack
36.6 mm
Forefoot stack
24.8 mm
Weight
299 g
Lug depth
3 mm
Plate
No
Waterproof
No
Lab measurements
Fit intelligence
Toebox width
Narrow toebox (76.7 mm vs 96 mm median)
Toebox height
Category-average height (24.5 mm vs 25 mm median)
True to size.
Fit numbers from the lab. Swell guidance: foot care.
Questions before you race
Is the Nike Ultrafly good for 100-mile races?
Great. 36.6 mm stack, cushion 5/5. 100-miler readiness score 74/100.
Does the Nike Ultrafly fit wide feet?
No. Toebox is 76.7 mm which is narrow. Look elsewhere if you need width.
What is the drop on the Nike Ultrafly?
11.8 mm, with a 36.6 mm heel stack and 24.8 mm forefoot.
Is the Nike Ultrafly good on wet rock?
Lab traction has not been measured for this model yet.
Manufacturer specs · Retailer listing
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swellingRoom: 100/100 (Elite)
descentTolerance: 73/100 (Great)
gritIngressRisk: 89/100 (Elite)
hotFootScore: 22/100 (Weak)
achillesFriendlyScore: 43/100 (Passable)
hundredMilerReadiness: 74/100 (Great)