Adidas Stan Smith vs Adidas Ultraboost 23 Sizing
Adidas Stan Smith vs Adidas Ultraboost 23: side-by-side fit, toe-box width and the exact size to order in each — they fit the same length. Free interactive sizing comparison.
Do the Adidas Stan Smith and Adidas Ultraboost 23 take the same size?
Yes — keep your usual size. A US 10 in the Stan Smith is about a US 10 in the Ultraboost 23.
How they compare
Adidas Stan Smith → Adidas Ultraboost 23: The Adidas Stan Smith runs true to size and has a slightly narrower toe box compared to the Adidas Ultraboost 23. Your US 10 in the Stan Smith translates to the same size in the Ultraboost 23.
Adidas Ultraboost 23 → Adidas Stan Smith: The Adidas Ultraboost 23 runs true to size and has a slightly wider toe box compared to the Adidas Stan Smith. Your US 10 in the Ultraboost 23 translates to the same size in the Stan Smith.
Spec comparison
| Spec | Adidas Stan Smith | Adidas Ultraboost 23 |
|---|---|---|
| Length Fit | True to Size | True to Size |
| Toe Box Profile | Standard | Wide |
| Arch Support | Low / Flat | High |
| Upper Material | Leather | Primeknit Textile |
Size conversion: Adidas Stan Smith → Adidas Ultraboost 23
If you wear these US sizes in the Stan Smith, here is the size to order in the Ultraboost 23.
| Your US size in Stan Smith | Recommended Ultraboost 23 size |
|---|---|
| US 8 | US 8 |
| US 9 | US 9 |
| US 10 | US 10 |
| US 11 | US 11 |
| US 12 | US 12 |
Frequently asked questions
Which runs bigger, the Adidas Stan Smith or the Adidas Ultraboost 23?
The Adidas Stan Smith and Adidas Ultraboost 23 fit the same in length — both are true to size — so you can keep your usual size moving between them.
If I wear a US 10 in the Stan Smith, what size is the Ultraboost 23?
Target a US 10 in the Ultraboost 23. A US 9 in the Stan Smith maps to about US 9, and a US 11 to about US 11.
Is the Stan Smith wider than the Ultraboost 23?
The Adidas Stan Smith has a slightly narrower toe box versus the Adidas Ultraboost 23 (standard vs wide). Forefoot room is one of the biggest reasons two shoes at the same length still feel different.
How do the Stan Smith and Ultraboost 23 compare on support and material?
The Stan Smith pairs low / flat arch support with a leather upper; the Ultraboost 23 has high support and a primeknit textile upper.
Try it: adjust the size and compare live
Verdict
The Adidas Stan Smith runs true to size and has a slightly narrower toe box compared to the Adidas Ultraboost 23. Your US 10 in the Stan Smith translates to the same size in the Ultraboost 23.
| Spec | Adidas Stan Smith | Adidas Ultraboost 23 |
|---|---|---|
| Length Fit | True to Size | True to Size |
| Toe Box Profile | Standard | Wide |
| Arch Support | Low / Flat | High |
| Upper Material | Leather | Primeknit Textile |