Thorlo Sock Sizing Chart
Sport Socks
| Sock Size | Men's Shoe Size | Women's Shoe Size |
| 9 | USA | - | 4-6 |
| EURO | - | 35-36.5 |
| UK | - | 2.5-4.5 |
|
| 11 | USA | 5.5-8.5 | 6.5-10 |
| EURO | 38-42 | 37-42 |
| UK | 4.5-7.5 | 5-8.5 |
|
| 13 | USA | 9-12.5 | 10.5-13 |
| EURO | 42.5-46.5 | 42.5-45 |
| UK | 8-11.5 | 9-11.5 |
|
| 15 | USA | 13-15 | - |
| EURO | 47-49 | - |
| UK | 12-14 | - |
Snow Socks
| Sock Size | Men's Shoe Size | Women's Shoe Size |
| 9 | USA | - | 4-6 |
| EURO | - | 35-36.5 |
| UK | - | 2.5-4.5 |
|
| 11 | USA | 5.5-8.5 | 6.5-10 |
| EURO | 38-42 | 37-42 |
| UK | 4.5-7.5 | 5-8.5 |
|
| 13 | USA | 9-12.5 | 10.5-13 |
| EURO | 42.5-46.5 | 42.5-45 |
| UK | 8-11.5 | 9-11.5 |
|
| 15 | USA | 13-15 | - |
| EURO | 47-49 | - |
| UK | 12-14 | - |
SKI and SNB Socks
| Sock Size | Men's Shoe Size | Women's Shoe Size |
| 9 | USA | - | 5-6.5 |
| EURO | - | 35-37 |
| UK | - | 2.5-4 |
|
| 10 | USA | 6-8 | 7-9 |
| EURO | 38.5-40 | 37.5-40 |
| UK | 5.5-6.5 | 5.5-6.5 |
|
| 11 | USA | 8.5-10 | 9.5-11.5 |
| EURO | 42-43.5 | 40.5-43 |
| UK | 8-9.5 | 7-9 |
|
| 12 | USA | 10.5-11.5 | - |
| EURO | 44-45.5 | - |
| UK | 10-11 | - |
|
| 14 | USA | 12-14 | - |
| EURO | 46-49 | - |
| UK | 11.5-13.5 | - |
Outdoor Socks
| Sock Size | Men's Shoe Size | Women's Shoe Size |
| 9 | USA | - | 4-6 |
| EURO | - | 35-36.5 |
| UK | - | 2.5-4.5 |
|
| 11 | USA | 5.5-8.5 | 6.5-10 |
| EURO | 38-42 | 37-42 |
| UK | 4.5-7.5 | 5-8.5 |
|
| 13 | USA | 9-12.5 | 10.5-13 |
| EURO | 42.5-46.5 | 42.5-45 |
| UK | 8-11.5 | 9-11.5 |
|
| 15 | USA | 13-15 | - |
| EURO | 47-49 | - |
| UK | 12-14 | - |
Kids Socks
| Sock Size | Boy's Shoe Size | Girl's Shoe Size |
| 7 | USA | 10-13 | 10-13 |
| EURO | 27-30 | 27-30 |
| UK | 9-12 | 9-12 |
|
| 9 | USA | 13.5-4 | 13.5-4 |
| EURO | 30.5-36 | 30.5-36 |
| UK | 12.5-3 | 12.5-3 |
|