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Both are Adidas models, but lasts differ. Ultraboost 1.0 is labeled True to Size (True to size; half up if wide feet or thick socks). Samba OG is Runs Narrow (True to size length; half up if wide feet).
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.
Adidas positions Samba as true to size with a regular-but-narrow fit; RunRepeat and wearer reports agree length is TTS while the toebox pinches wider feet. Stick to your usual size if narrow/average; go half up primarily for width, not length.
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 | Samba OG | |
|---|---|---|
| Verdict | True to Size | Runs Narrow |
| Advice | True to size; half up if wide feet or thick socks | True to size length; half up if wide feet |
| Width | Primeknit stretches; TPU midfoot cage can still pinch wide feet | Narrow low-volume last — common complaint |
| Break-in | None | Leather needs short break-in |
| Fit offset | +0 | +0 |
| 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 Samba OG | Note |
|---|---|---|
| US 7 | US 7 | offset +0 |
| US 7.5 | US 7.5 | offset +0 |
| US 8 | US 8 | offset +0 |
| US 8.5 | US 8.5 | offset +0 |
| US 9 | US 9 | offset +0 |
| US 9.5 | US 9.5 | offset +0 |
| US 10 | US 10 | offset +0 |
| US 10.5 | US 10.5 | offset +0 |
| US 11 | US 11 | offset +0 |
| US 12 | US 12 | offset +0 |
Check prices: Ultraboost 1.0 Samba OG (paid link)
Full Ultraboost 1.0 guide · Full Samba OG guide · Reverse compare · Open in converter