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Different brands — charts and lasts both matter. Ultraboost 1.0 is labeled True to Size (True to size; half up if wide feet or thick socks). Boost 350 V2 is Runs Small (Size up half a size (full size if wide feet or thick socks)).
Ultraboost 1.0 is generally true to size for a sock-like lockdown. Primeknit gives with wear, but the midfoot cage does not — wide feet and thick-sock wearers commonly go half a size up. Prefer TTS if you want the intended performance hug.
Yeezy Boost 350 V2 is widely agreed to run about a half size small versus everyday sneakers. Large owner datasets and retailer guides converge on half up; wide feet and thick socks often need a full size. Do not copy V1 TTS advice — V2 is the snugger iteration.
Use the table below as a starting point from fit offsets — then confirm with try-on or returns. Width can matter more than length between these two.
| Ultraboost 1.0 | Boost 350 V2 | |
|---|---|---|
| Verdict | True to Size | Runs Small |
| Advice | True to size; half up if wide feet or thick socks | Size up half a size (full size if wide feet or thick socks) |
| Width | Primeknit stretches; TPU midfoot cage can still pinch wide feet | Tapered Primeknit toebox — limited stretch; thick socks often force full size up |
| Break-in | None | Primeknit gives slightly but will not fix a short size |
| Fit offset | +0 | +0.5 |
| Confidence | high | high |
If the left model fits at the listed size, start here in the right model (chart + fit offsets).
| If Ultraboost 1.0 fits | Try Boost 350 V2 | Note |
|---|---|---|
| US 7 | US 7.5 | offset +0.5 |
| US 7.5 | US 8 | offset +0.5 |
| US 8 | US 8.5 | offset +0.5 |
| US 8.5 | US 9 | offset +0.5 |
| US 9 | US 9.5 | offset +0.5 |
| US 9.5 | US 10 | offset +0.5 |
| US 10 | US 10.5 | offset +0.5 |
| US 10.5 | US 11 | offset +0.5 |
| US 11 | US 11.5 | offset +0.5 |
| US 12 | US 12.5 | offset +0.5 |
Check prices: Ultraboost 1.0 Boost 350 V2 (paid link)
Full Ultraboost 1.0 guide · Full Boost 350 V2 guide · Reverse compare · Open in converter