| Hat Size | Measurement in Inches | Size Needed | ||
| 6-1/2 | = | 20- 1/4" | = | X-Small |
| 6-5/8 | = | 20- 3/4" | = | X-Small |
| 6-3/4 | = | 21-1/8" | = | Small |
| 6-7/8 | = | 21-1/2" | = | Small |
| 7 | = | 21-7/8" | = | Medium |
| 7-1/8 | = | 22-1/4" | = | Medium |
| 7-1/4 | = | 22-5/8" | = | Large |
| 7-3/8 | = | 23" | = | Large |
| 7-1/2 | = | 23-1/2" | = | X-Large |
| 7-5/8 | = | 23-7/8" | = | X-Large |
| 7-3/4 | = | 24-1/4" | = | XX-Large |
| 7-7/8 | = | 24-5/8" | = | |
| 8 | = | 25" | = | |