On Cloud 5 vs Nike React Infinity Run 4 Sizing
On Cloud 5 vs Nike React Infinity Run 4: side-by-side fit, toe-box width and the exact size to order in each — Nike React Infinity Run 4 runs bigger. Free interactive sizing comparison.
Should you size down from the On Cloud 5 to the Nike React Infinity Run 4?
Yes — size down a half size. If you wear a US 10 in the Cloud 5, order about a US 9.5 in the React Infinity Run 4.
How they compare
On Cloud 5 → Nike React Infinity Run 4: The On Cloud 5 runs about a half-size small and has a much narrower toe box compared to the Nike React Infinity Run 4. If you wear a US 10 in the Cloud 5, your target size for the React Infinity Run 4 is US 9.5.
Nike React Infinity Run 4 → On Cloud 5: The Nike React Infinity Run 4 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 React Infinity Run 4, your target size for the Cloud 5 is US 10.5.
Spec comparison
| Spec | On Cloud 5 | Nike React Infinity Run 4 |
|---|---|---|
| Length Fit | Runs Small (~½ size) | True to Size |
| Toe Box Profile | Narrow | Wide |
| Arch Support | Moderate | High |
| Upper Material | Textile | Flyknit |
Size conversion: On Cloud 5 → Nike React Infinity Run 4
If you wear these US sizes in the Cloud 5, here is the size to order in the React Infinity Run 4.
| Your US size in Cloud 5 | Recommended React Infinity Run 4 size |
|---|---|
| US 8 | US 7.5 |
| US 9 | US 8.5 |
| US 10 | US 9.5 |
| US 11 | US 10.5 |
| US 12 | US 11.5 |
Frequently asked questions
Which runs bigger, the On Cloud 5 or the Nike React Infinity Run 4?
The Nike React Infinity Run 4 runs longer than the On Cloud 5. The Cloud 5 is the snugger of the two, so you may want extra length going the other way.
If I wear a US 10 in the Cloud 5, what size is the React Infinity Run 4?
Target a US 9.5 in the React Infinity Run 4. A US 9 in the Cloud 5 maps to about US 8.5, and a US 11 to about US 10.5.
Is the Cloud 5 wider than the React Infinity Run 4?
The On Cloud 5 has a much narrower toe box versus the Nike React Infinity Run 4 (narrow vs wide). Forefoot room is one of the biggest reasons two shoes at the same length still feel different.
How do the Cloud 5 and React Infinity Run 4 compare on support and material?
The Cloud 5 pairs moderate arch support with a textile upper; the React Infinity Run 4 has high support and a flyknit upper.
Try it: adjust the size and compare live
Verdict
The On Cloud 5 runs about a half-size small and has a much narrower toe box compared to the Nike React Infinity Run 4. If you wear a US 10 in the Cloud 5, your target size for the React Infinity Run 4 is US 9.5.
| Spec | On Cloud 5 | Nike React Infinity Run 4 |
|---|---|---|
| Length Fit | Runs Small (~½ size) | True to Size |
| Toe Box Profile | Narrow | Wide |
| Arch Support | Moderate | High |
| Upper Material | Textile | Flyknit |