Smartwool Sock Size Chart
Men's
| Size | S | M | L | XL |
| US Men's Shoe | 3 - 5.5 | 6 - 8.5 | 9 - 11.5 | 12 - 14.5 |
| EUR Shoe | 34 - 37 | 38 - 41 | 42 - 45 | 46 - 49 |
| UK Shoe | 2 - 4.5 | 5 - 7.5 | 8 - 10.5 | 11 - 13.5 |
| Calf Circumference (Largest part of the calf) | 11 - 14.5" (18-26.5cm) | 12.5 - 16.5" (32-41cm) | 14.5 - 18" (37-45.5cm) | 16-23" (41-58cm) |
Women's
| Size | S | M | L | XL |
| US Women's Shoe | 4 - 6.5 | 7 - 9.5 | 10 - 12.5 | - |
| EUR Shoe | 34 - 37 | 38 - 41 | 42 - 45 | 46 - 49 |
| UK Shoe | 2 - 4.5 | 5 - 7.5 | 8 - 10.5 | 11 - 13.5 |
| Calf Circumference (Largest part of the calf) | 11 - 14.5" (18-26.5cm) | 12.5 - 16.5" (32-41cm) | 14.5 - 18" (37-45.5cm) | 16 - 23" (41-58cm) |
Kids
| Size | XS | S | M | L |
| US Kids Shoe | 6 - 8.5 | 9 - 11.5 | 12 - 2.5 | 3 - 6 |
| EUR Shoe | 22 - 25 | 26 - 28 | 29 - 32 | 33 - 36 |
| UK Shoe | 5 - 7.5 | 8 - 10.5 | 11 - 13.5 | 1 - 4.5 |