Adidas Ultraboost 23 vs ASICS Gel-Nimbus 25 Sizing
Adidas Ultraboost 23 vs ASICS Gel-Nimbus 25: 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 ASICS Gel-Nimbus 25 take the same size?
Yes — keep your usual size. A US 10 in the Ultraboost 23 is about a US 10 in the Gel-Nimbus 25.
How they compare
Adidas Ultraboost 23 → ASICS Gel-Nimbus 25: The Adidas Ultraboost 23 runs true to size, similar in width to the ASICS Gel-Nimbus 25. Your US 10 in the Ultraboost 23 translates to the same size in the Gel-Nimbus 25.
ASICS Gel-Nimbus 25 → Adidas Ultraboost 23: The ASICS Gel-Nimbus 25 runs true to size, similar in width to the Adidas Ultraboost 23. Your US 10 in the Gel-Nimbus 25 translates to the same size in the Ultraboost 23.
Spec comparison
| Spec | Adidas Ultraboost 23 | ASICS Gel-Nimbus 25 |
|---|---|---|
| Length Fit | True to Size | True to Size |
| Toe Box Profile | Wide | Wide |
| Arch Support | High | High |
| Upper Material | Primeknit Textile | Engineered Mesh |
Size conversion: Adidas Ultraboost 23 → ASICS Gel-Nimbus 25
If you wear these US sizes in the Ultraboost 23, here is the size to order in the Gel-Nimbus 25.
| Your US size in Ultraboost 23 | Recommended Gel-Nimbus 25 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 ASICS Gel-Nimbus 25?
The Adidas Ultraboost 23 and ASICS Gel-Nimbus 25 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 Gel-Nimbus 25?
Target a US 10 in the Gel-Nimbus 25. 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 Gel-Nimbus 25?
The Adidas Ultraboost 23 has a similar toe box width versus the ASICS Gel-Nimbus 25 (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 Gel-Nimbus 25 compare on support and material?
The Ultraboost 23 pairs high arch support with a primeknit textile upper; the Gel-Nimbus 25 has high support and a engineered mesh upper.
Try it: adjust the size and compare live
Verdict
The Adidas Ultraboost 23 runs true to size, similar in width to the ASICS Gel-Nimbus 25. Your US 10 in the Ultraboost 23 translates to the same size in the Gel-Nimbus 25.
| Spec | Adidas Ultraboost 23 | ASICS Gel-Nimbus 25 |
|---|---|---|
| Length Fit | True to Size | True to Size |
| Toe Box Profile | Wide | Wide |
| Arch Support | High | High |
| Upper Material | Primeknit Textile | Engineered Mesh |