| Sock Size | Fits Youth Shoe Size | Fits Women's Shoe Size | Fits Men's Shoe Size | UK Shoe Size | EC Shoe Size |
| Youth YS (5-6) | 4-7 Toddler | ||||
| Youth YM (6-7) | 7-10 Toddler | 7-10 | 25-28 | ||
| Youth YL (7-9) | 10-2 | 3-5 | 10-12 | 28-31 | |
| Youth YX (8-9-1/2) | 1-5 | 4-7 | 1-5 | 32-38 | |
| Adult SM (7-9) | 10-2 | 3-5 | 10-12 | 28-31 | |
| Adult MS (8-9-1/2) | 1-5 | 4-7 | 1-5 | 32-38 | |
| Adult MD (9-11) | 6-10 | 5-9-1/2 | 4-8 | 37-42 | |
| Adult LG (11-13) | 10-13 | 9-12 | 8-11-1/2 | 43-47 | |
| Adult XL (13-15) | 12-15 | 12-14 | 47-50 | ||
| Adult XXL (15-17) | 15-17 | 15+ | 51+ |
Measurements stated in inches unless otherwise indicated.