Authentic vs Old Skool
Both models are from Vans, but they fit differently: Old Skool runs about 0.5 US size larger than Authentic at the same label.
Equivalent size at US men 9
Authentic US 9 = Old Skool US 8.5 (0.5 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; Foot length: 258 mm.
| Model | Recommended US men | Foot length | UK | EU | CM |
|---|---|---|---|---|---|
| Authentic | 9 | 258 mm | 7.5 | 39 | 26 |
| Old Skool (equivalent) | 8.5 | 258 mm | 7.5 | 39 | 26 |