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Not sure of your size? Here is Smartwool's recommended sizing chart:
| Size | Small | Medium | Large | X-Large |
| Womens US | 4 - 6.5 | 7 - 9.5 | 10 - 12.5 | |
| Mens US | 3 - 5.5 | 6 - 8.5 | 9 - 11.5 | 12 - 14.5 |
| EU | 34 - 37 | 39 - 41 | 42 - 45 | 46 - 48 |