NMD R1 vs Ultraboost
Both are Adidas models but they fit differently: Ultraboost runs about 0.5 size s larger than NMD R1 at the same labelled US size.
At US men's 9 on NMD R1
If you wear NMD R1 in US 9, start with Ultraboost in US 8.5: go down 0.5 US sizes. The calculation keeps the same foot length anchor, about 262mm, then removes the NMD R1 fit offset (+0) and applies the Ultraboost fit offset (+0.25).
| Model | Recommended US | Foot mm | UK | EU | CM |
|---|---|---|---|---|---|
| NMD R1 | 9 | 262 | 8 | 39 | 26 |
| Ultraboost (equivalent) | 8.5 | 262 | 8 | 39 | 26 |