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Both are Adidas models, but lasts differ. Samba OG is labeled Runs Narrow (True to size length; half up if wide feet). Ultraboost 1.0 is True to Size (True to size; half up if wide feet or thick socks).
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.
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.
| Samba OG | Ultraboost 1.0 | |
|---|---|---|
| Verdict | Runs Narrow | True to Size |
| Advice | True to size length; half up if wide feet | True to size; half up if wide feet or thick socks |
| Width | Narrow low-volume last — common complaint | Primeknit stretches; TPU midfoot cage can still pinch wide feet |
| Break-in | Leather needs short break-in | None |
| 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 Samba OG fits | Try Ultraboost 1.0 | 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: Samba OG Ultraboost 1.0 (paid link)
Full Samba OG guide · Full Ultraboost 1.0 guide · Reverse compare · Open in converter