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Different brands — charts and lasts both matter. Boost 350 V2 is labeled Runs Small (Size up half a size (full size if wide feet or thick socks)). Ultraboost 1.0 is True to Size (True to size; half up if wide feet or thick socks).
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.
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.
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.
| Boost 350 V2 | Ultraboost 1.0 | |
|---|---|---|
| Verdict | Runs Small | True to Size |
| Advice | Size up half a size (full size if wide feet or thick socks) | True to size; half up if wide feet or thick socks |
| Width | Tapered Primeknit toebox — limited stretch; thick socks often force full size up | Primeknit stretches; TPU midfoot cage can still pinch wide feet |
| Break-in | Primeknit gives slightly but will not fix a short size | None |
| Fit offset | +0.5 | +0 |
| Confidence | high | high |
If the left model fits at the listed size, start here in the right model (chart + fit offsets).
| If Boost 350 V2 fits | Try Ultraboost 1.0 | Note |
|---|---|---|
| US 7 | US 6.5 | offset -0.5 |
| US 7.5 | US 7 | offset -0.5 |
| US 8 | US 7.5 | offset -0.5 |
| US 8.5 | US 8 | offset -0.5 |
| US 9 | US 8.5 | offset -0.5 |
| US 9.5 | US 9 | offset -0.5 |
| US 10 | US 9.5 | offset -0.5 |
| US 10.5 | US 10 | offset -0.5 |
| US 11 | US 10.5 | offset -0.5 |
| US 12 | US 11.5 | offset -0.5 |
Check prices: Boost 350 V2 Ultraboost 1.0 (paid link)
Full Boost 350 V2 guide · Full Ultraboost 1.0 guide · Reverse compare · Open in converter