CoreScore breakdown
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ReebokNano X4
Conquer the box.
Best for
Not ideal for
Verdict
The Reebok Nano X4 is a high-performing option in its class — a cross-training scoring 85/100 in SoleHunt's data-driven evaluation, drawing on 0 consumer reviews and 0 independent expert tests. Tipping the scales at 310g, it is moderately heavy for a cross-training. The 19mm heel stack — a minimal stack — delivers a firm ride at 45 HC, returning 46% of impact energy and feeling cushion-focused rather than reactive underfoot. Geometrically, the Nano X4 runs on a low 4mm drop that suits midfoot and forefoot strikers, with a 15mm forefoot stack that creates a naturally ground-hugging feel. Fit-wise, the toebox measures 92mm — medium-width, comfortable for most foot shapes — and the upper comes in a standard width. True to size. Slightly roomier than Metcon. The removable insole makes it compatible with custom orthotics. It is designed for crossfit, weightlifting, gym workouts, hiit, and performs less well for running or outdoor use.
Lab measurements
Weight
310g
UK size 9 men's
Heel drop
4mm
Low drop
Heel stack
19mm
Forefoot stack
15mm
Midsole hardness
45HC
Firm
Energy return
46%
Higher = bouncier
Toebox width
92mm
Breathability
72/100
Outsole grip
83/100
Flexibility
54/100
Heel counter
4/5
Ankle hold
Sustainability
15%
Recycled content
Fit guide
Sizing specs
Best for
Not ideal for
Price tracker
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