Ultralight Running Size Chart
| Sock size | US men's shoe size |
US women's shoe size |
| X-small | 5-5.5 | |
| Small | 6-7.5 | 7-8.5 |
| Medium | 8-9.5 | 9-10.5 |
| Large | 10-11.5 | 11-13 |
| X-large | 12-14 |
Close
| Sock size | US men's shoe size |
US women's shoe size |
| X-small | 5-5.5 | |
| Small | 6-7.5 | 7-8.5 |
| Medium | 8-9.5 | 9-10.5 |
| Large | 10-11.5 | 11-13 |
| X-large | 12-14 |