Air Max 90 sizing: true to size, half up if wide

Fit depth guide

Nike Air Max 90 is generally true to size in length for most Nike wearers, with a more accommodating feel than the narrower Air Max 1 for many feet. The visible Air unit and padded upper create a lifestyle fit that usually does not require the AF1 half-size-down habit.

Width is mid-pack: not as skinny as Cortez, not as cavernous as some AF1s. Wide feet may still prefer half up or wide options where sold; narrow feet TTS happily.

Break-in is light — foam and mesh/leather overlays soften quickly. Older deadstock pairs can feel stiffer until flexed.

Versus Air Max 1: AM1 is often called out as narrower; AM90 is the cushier daily option for many. Versus AF1: different length perception — do not copy AF1 downsizing automatically.

Sizing tips: start TTS from your Nike lifestyle size. Between sizes, prefer the larger if you wear thick socks or have wide forefeet. Lace adjustment fine-tunes midfoot lockdown more than size changes alone.

What the US 9 chart and lab width imply

This page's RunRepeat cut at US men's 9 publishes width only: 90.7 mm forefoot and 70.4 mm toebox. There is no published internal length on this lab cut — we do not invent one. Nike chart cm for that same US 9 is 26.2 cm of foot length; US 10 is 27.1 cm; a half size on the table is 26.7 → 27.1 → 27.5 cm. Length advice on this page still comes from the TTS Nike cluster (Jordan 1 / Dunk), not from a missing millimeter of cavity.

90.7 / 70.4 mm at US 9 is mid-pack, which matches the mudguard note: wide feet commonly half-up for overlay volume, not because the chart cm is short. The converter offset is +0 US. The wear-box maps Air Max 90 US 10 to Air Max 1 US 10 (same length family — confirm width) and Air Force 1 '07 US 10 to Air Max 90 10.5. That +0.5 is undoing AF1's half-down, not claiming AM90 runs small. Do not copy an AF1 size-down into 90s and then half-up again for the mudguard — pick one length story.

If your measured foot already hits 26.2 cm, US 9 is the chart ticket; the lab widths tell you whether mudguard panels will pinch before length does. Empty internal-length fields stay empty on purpose.