Ultraboost 1.0
Ultraboost 1.0 is true to size in length. Stay TTS for the sock-like hug; go half up only if you have wide feet or wear thick socks. Primeknit stretches. The TPU midfoot cage does not.
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Interactive suggestion based on this model’s fit offset (+0 US). Always confirm with a retailer return policy.
Brand / model converter · Compare brands · Guides · Fit feedback
Numbers only when sourced. Empty fields stay blank — we do not invent mm.
| US M | UK | EU | cm |
|---|---|---|---|
| 6 | 5.5 | 38.5 | 23.5 |
| 6.5 | 6 | 39 | 24 |
| 7 | 6.5 | 40 | 24.5 |
| 7.5 | 7 | 40.5 | 25 |
| 8 | 7.5 | 41 | 25.4 |
| 8.5 | 8 | 42 | 25.9 |
| 9 | 8.5 | 42.5 | 26.2 |
| 9.5 | 9 | 43 | 26.7 |
| 10 | 9.5 | 44 | 27.1 |
| 10.5 | 10 | 44.5 | 27.5 |
| 11 | 10.5 | 45 | 27.9 |
| 11.5 | 11 | 45.5 | 28.4 |
| 12 | 11.5 | 46 | 28.8 |
| 13 | 12.5 | 47.5 | 29.7 |
Chart cm is approximate foot length for label matching — not a lab internal cut. Use the cm converter to map foot length across brands.
Ultraboost 1.0 is generally true to size for a sock-like lockdown. Primeknit gives with wear, but the midfoot cage does not — wide feet and thick-sock wearers commonly go half a size up. Prefer TTS if you want the intended performance hug.
Sources: SoleFeed Ultraboost (TTS; half up if wide) · MyTrueSize / PerfectSizeFinder Ultraboost guide (TTS majority) · Sole Supplier UltraBOOST fit notes (TTS; half up for room) · methodology
Adidas uses a 1-size women’s→men’s US gap (not always 1.5). Convert your women’s US size with this model’s fit offset built in.
Ultraboost 1.0 is a sock-fit runner. Length usually matches your normal Adidas size. The Primeknit upper feels snug on day one and stretches; the plastic midfoot cage is what bites wide feet. Later Light Boost SKUs change foam, not this length rule.
| If you… | Buy |
|---|---|
| Wear a usual Adidas street size, average volume | Same US size (TTS) |
| Have a wide midfoot or wear thick socks | Half up |
| Wear Yeezy Boost 350 V2 at US 10 | Ultraboost 9.5 |
| Wear Samba OG at US 10 | Ultraboost 10 — Samba is narrower, not shorter |
| Want the intended sock hug | Stay TTS; do not size up “for comfort” |
The brand chart on this page lists 26.2 cm at US men's 9. That is the same Adidas foot-length ladder used on Gazelle and Samba OG, and this page already labels it as chart cm — not a lab internal cut. The converter offset is +0 US because length usually matches a typical street size. If your measured foot already sits on 26.2 cm, start at US 9; the chart is a label match, not a reason to half-size on length.
The fit bar stays true to size for that reason. The width note is the override: Primeknit stretches with wear, but the TPU midfoot cage does not. Half up is for wide feet or thick socks, not because labeled length is short. Break-in is listed as none — the knit gives a little; the cage will not pack out.
Women's pages use Adidas' 1-size women's→men's gap, not always 1.5. Do not copy a Yeezy half-up habit onto 1.0.
Anonymous fit check for Adidas Ultraboost 1.0. Helps future readers — we never invent crowd stats.
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Secondary Mondopoint-style table. Prefer the brand chart in Measured / size chart (cm) when converting. Primary system: US_M.
| US | UK | EU | cm |
|---|---|---|---|
| 6 | 5.5 | 39 | 24.0 |
| 6.5 | 6 | 39.5 | 24.5 |
| 7 | 6.5 | 40 | 25.0 |
| 7.5 | 7 | 40.5 | 25.5 |
| 8 | 7.5 | 41 | 26.0 |
| 8.5 | 8 | 42 | 26.5 |
| 9 | 8.5 | 42.5 | 27.0 |
| 9.5 | 9 | 43 | 27.5 |
| 10 | 9.5 | 44 | 28.0 |
| 10.5 | 10 | 44.5 | 28.5 |
| 11 | 10.5 | 45 | 29.0 |
| 11.5 | 11 | 45.5 | 29.5 |
| 12 | 11.5 | 46 | 30.0 |
| 13 | 12.5 | 47.5 | 31.0 |
