Adidas Ultraboost 23 vs Nike React Infinity Run 4 Sizing
Adidas Ultraboost 23 vs Nike React Infinity Run 4: 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 Ultraboost 23 and Nike React Infinity Run 4 take the same size?
Yes — keep your usual size. A US 10 in the Ultraboost 23 is about a US 10 in the React Infinity Run 4.
How they compare
Adidas Ultraboost 23 → Nike React Infinity Run 4: The Adidas Ultraboost 23 runs true to size, similar in width to the Nike React Infinity Run 4. Your US 10 in the Ultraboost 23 translates to the same size in the React Infinity Run 4.
Nike React Infinity Run 4 → Adidas Ultraboost 23: The Nike React Infinity Run 4 runs true to size, similar in width to the Adidas Ultraboost 23. Your US 10 in the React Infinity Run 4 translates to the same size in the Ultraboost 23.
Spec comparison
| Spec | Adidas Ultraboost 23 | Nike React Infinity Run 4 |
|---|---|---|
| Length Fit | True to Size | True to Size |
| Toe Box Profile | Wide | Wide |
| Arch Support | High | High |
| Upper Material | Primeknit Textile | Flyknit |
Size conversion: Adidas Ultraboost 23 → Nike React Infinity Run 4
If you wear these US sizes in the Ultraboost 23, here is the size to order in the React Infinity Run 4.
| Your US size in Ultraboost 23 | Recommended React Infinity Run 4 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 Ultraboost 23 or the Nike React Infinity Run 4?
The Adidas Ultraboost 23 and Nike React Infinity Run 4 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 Ultraboost 23, what size is the React Infinity Run 4?
Target a US 10 in the React Infinity Run 4. A US 9 in the Ultraboost 23 maps to about US 9, and a US 11 to about US 11.
Is the Ultraboost 23 wider than the React Infinity Run 4?
The Adidas Ultraboost 23 has a similar toe box width versus the Nike React Infinity Run 4 (wide vs wide). Forefoot room is one of the biggest reasons two shoes at the same length still feel different.
How do the Ultraboost 23 and React Infinity Run 4 compare on support and material?
The Ultraboost 23 pairs high arch support with a primeknit textile upper; the React Infinity Run 4 has high support and a flyknit upper.
Try it: adjust the size and compare live
Verdict
The Adidas Ultraboost 23 runs true to size, similar in width to the Nike React Infinity Run 4. Your US 10 in the Ultraboost 23 translates to the same size in the React Infinity Run 4.
| Spec | Adidas Ultraboost 23 | Nike React Infinity Run 4 |
|---|---|---|
| Length Fit | True to Size | True to Size |
| Toe Box Profile | Wide | Wide |
| Arch Support | High | High |
| Upper Material | Primeknit Textile | Flyknit |