Stan Smith vs Ultraboost
Both models are from Adidas, but they fit differently: Ultraboost runs about 1 US size larger than Stan Smith at the same label.
Equivalent size at US men 9
Stan Smith US 9 = Ultraboost US 8 (1 US smaller). Keep foot length in millimetres as the shared reference across US, UK, EU and CM systems. A race shoe, boot, clog and lifestyle sneaker can fit differently even inside the same brand. fit_offset: -0.5 -> +0.25; Foot length: 258 mm.
| Model | Recommended US men | Foot length | UK | EU | CM |
|---|---|---|---|---|---|
| Stan Smith | 9 | 258 mm | 7.5 | 39 | 26 |
| Ultraboost (equivalent) | 8 | 258 mm | 7.5 | 39 | 26 |