ShoesUnder ArmourSurge 4
Under Armour
Under Armour Surge 4
Under Armour Surge 4. 33.5mm stack, 295g. 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? 33.5 mm stack, cushion 4/5
Descent tolerance
Does it save your toenails on long descents? 24.5 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? 9 mm drop, heel counter 3/5
Full specs
Drop
9 mm
Heel stack
33.5 mm
Forefoot stack
24.5 mm
Weight
295 g
Plate
No
Waterproof
No
Lab measurements
Fit intelligence
Toebox width
Narrow toebox (73.2 mm vs 96 mm median)
Toebox height
Category-average height (24.5 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 Under Armour Surge 4 good for 100-mile races?
Great. 33.5 mm stack, cushion 4/5. 100-miler readiness score 78/100.
Does the Under Armour Surge 4 fit wide feet?
No. Toebox is 73.2 mm which is narrow. Look elsewhere if you need width.
What is the drop on the Under Armour Surge 4?
9 mm, with a 33.5 mm heel stack and 24.5 mm forefoot.
Is the Under Armour Surge 4 good on wet rock?
Traction coefficient of friction on wet lab surface: 0.53. Solid grip on wet rock.
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swellingRoom: 100/100 (Elite)
descentTolerance: 73/100 (Great)
gritIngressRisk: 95/100 (Elite)
hotFootScore: 22/100 (Weak)
achillesFriendlyScore: 57/100 (Solid)
hundredMilerReadiness: 78/100 (Great)