Adidas Ultraboost 23 vs On Cloud 5 Sizing
Adidas Ultraboost 23 vs On Cloud 5: side-by-side fit, toe-box width and the exact size to order in each — Adidas Ultraboost 23 runs bigger. Free interactive sizing comparison.
Should you size up from the Adidas Ultraboost 23 to the On Cloud 5?
Yes — size up a half size. If you wear a US 10 in the Ultraboost 23, order about a US 10.5 in the Cloud 5.
How they compare
Adidas Ultraboost 23 → On Cloud 5: The Adidas Ultraboost 23 runs true to size and has a much wider toe box compared to the On Cloud 5. If you wear a US 10 in the Ultraboost 23, your target size for the Cloud 5 is US 10.5.
On Cloud 5 → Adidas Ultraboost 23: The On Cloud 5 runs about a half-size small and has a much narrower toe box compared to the Adidas Ultraboost 23. If you wear a US 10 in the Cloud 5, your target size for the Ultraboost 23 is US 9.5.
Spec comparison
| Spec | Adidas Ultraboost 23 | On Cloud 5 |
|---|---|---|
| Length Fit | True to Size | Runs Small (~½ size) |
| Toe Box Profile | Wide | Narrow |
| Arch Support | High | Moderate |
| Upper Material | Primeknit Textile | Textile |
Size conversion: Adidas Ultraboost 23 → On Cloud 5
If you wear these US sizes in the Ultraboost 23, here is the size to order in the Cloud 5.
| Your US size in Ultraboost 23 | Recommended Cloud 5 size |
|---|---|
| US 8 | US 8.5 |
| US 9 | US 9.5 |
| US 10 | US 10.5 |
| US 11 | US 11.5 |
| US 12 | US 12.5 |
Frequently asked questions
Which runs bigger, the Adidas Ultraboost 23 or the On Cloud 5?
The Adidas Ultraboost 23 runs longer than the On Cloud 5 — it sits true to size while the other runs small, so size accordingly when moving between them.
If I wear a US 10 in the Ultraboost 23, what size is the Cloud 5?
Target a US 10.5 in the Cloud 5. A US 9 in the Ultraboost 23 maps to about US 9.5, and a US 11 to about US 11.5.
Is the Ultraboost 23 wider than the Cloud 5?
The Adidas Ultraboost 23 has a much wider toe box versus the On Cloud 5 (wide vs narrow). Forefoot room is one of the biggest reasons two shoes at the same length still feel different.
How do the Ultraboost 23 and Cloud 5 compare on support and material?
The Ultraboost 23 pairs high arch support with a primeknit textile upper; the Cloud 5 has moderate support and a textile upper.
Try it: adjust the size and compare live
Verdict
The Adidas Ultraboost 23 runs true to size and has a much wider toe box compared to the On Cloud 5. If you wear a US 10 in the Ultraboost 23, your target size for the Cloud 5 is US 10.5.
| Spec | Adidas Ultraboost 23 | On Cloud 5 |
|---|---|---|
| Length Fit | True to Size | Runs Small (~½ size) |
| Toe Box Profile | Wide | Narrow |
| Arch Support | High | Moderate |
| Upper Material | Primeknit Textile | Textile |