| Size | Hat Size | Metric (CM) | Inches |
| XX Small | 6-3/4 to 6-7/8 | 54 to 55 | 21-1/4 to 21-5/8 |
| X Small | 7 | 56 | 22 |
| Small | 7-1/8 | 57 | 22-3/8 |
| Medium | 7-1/4 to 7-3/8 | 58 to 59 | 22-3/4 to 23-1/8 |
| Large | 7-1/2 to 7-5/8 | 60 to 61 | 23-1/2 to 23-7/8 |
| X Large | 7-3/4 | 62 to 63 | 24-1/4 |
| XX Large | 8 to 8-1/2 | 64 to 68 | 25-1/8 to 26-3/8 |