OOFOS
Men
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If you normally wear a whole size: Order the same whole size OOFOS.
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If you normally wear a half size: Order a half size DOWN for best fit.
Women
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If you normally wear a whole size: Order the same whole size OOFOS.
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If you normally wear a half size: Order a half size UP for best fit.
Note: All sizes displayed on oofos.co.uk use UK Sizing System.
| Foot Length | US Men | UK Men | US Women | UK Women | EU |
| 222 mm | 2 | 1 | 4 | 2 | 35 |
| 228 mm | 3 | 2 | 5 | 3 | 36 |
| 235 mm | 4 | 3 | 6 | 4 | 37 |
| 241 mm | 5 | 4 | 7 | 5 | 38 |
| 248 mm | 6 | 5 | 8 | 6 | 39 |
| 254 mm | 7 | 6 | 9 | 7 | 40 |
| 260 mm | 8 | 7 | 10 | 8 | 41 |
| 267 mm | 9 | 8 | 11 | 9 | 42 |
| 273 mm | 10 | 9 | 12 | 10 | 43 |
| 279 mm | 11 | 10 | 13 | 11 | 44 |
| 286 mm | 12 | 11 | 14 | 12 | 45 |
| 292 mm | 13 | 12 | 15 | 13 | 46 |
| 302 mm | 14 | 13 | 16 | 14 | 47 |