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| US Women's | US Men's | EU | Mondo | Japan (cm) | Mexico (cm) | China (mm) |
| 5 | - | 36 | 21 | 21 | 21 | 210 |
| 6 | - | 37 | 22 | 22 | 22 | 220 |
| 7 | - | 38 | 23 | 23 | 23 | 230 |
| 8 | - | 39 | 24 | 24 | 24 | 240 |
| 9 | - | 40 | 25 | 25 | 25 | 250 |
| 10 | 8 | 41 | 26 | 26 | 26 | 260 |
| 11 | 9 | 42 | 27 | 27 | 27 | 270 |
| - | 10 | 43 | 28 | 28 | 28 | 280 |
| - | 11 | 44 | 29 | 29 | 29 | 290 |
| - | 12 | 45 | 30 | 30 | 30 | 300 |
| - | 13 | 46 | 31 | 31 | 31 | 310 |
| - | 14 | 47 | 32 | 32 | 32 | 320 |
* Size notes: Our insoles run 'true to size' for performance footwear (e.g., running shoes, hiking boots, etc). We offer a complete size run for women & men. If you typically wear a half-size shoe, we recommend that you round up to the next size; e.g., 7.5 rounds up to 8, etc. You can trim Tread & Butter insoles. Generally, it won't be necessary in high volume footwear like running shoes and hiking boots but it might make sense in lower volume footwear like cycling shoes and some ski boots. Questions: hello@treadandbutter.com