| Order Size | Hat Size | Head Size Inches | Head Size CM |
| Small | 6 3/4 | 21 1/8 " | 54 |
| 6 7/8 | 21 1/2 " | 55 | |
| 7 | 21 7/8 " | 56 | |
| Medium | 7 1/8 | 22 1/4 " | 57 |
| 7 1/4 | 22 5/8 " | 58 | |
| 7 3/8 | 23 " | 59 | |
| 7 1/2 | 23 1/2 " | 60 | |
| X-Large | 7 5/8 | 23 7/8 " | 61 |
| 7 3/4 | 24 1/4 " | 62 | |
| *XX-Large | 7 7/8 | 24 5/8 " | 63 |
| *XXX-Large | 8 1/8 | 25 3/8 " | 64 |