| Adult | Hat Size | Inches | CM |
| XS | 6-5/8 - 6-3/4 | 20-87 - 21.26 in. | 53-54cm |
| S | 6-7/8 - 7 | 21.27 - 22.05 in. | 55-56 cm |
| M | 7-1/8 - 7-1/4 | 22.06 - 22.83 in. | 57-58 cm |
| L | 7-3/8 - 7-3/4 | 22.84 - 23.62 in. | 59-60 cm |
| XL | 7-5/8 - 7-7/8 | 23.63 - 24.41 in. | 61-62 cm |
| Adult | Hat Size | Inches | CM |
| XS | 6-5/8 - 6-3/4 | 20-87 - 21.26 in. | 53-54cm |
| S | 6-7/8 - 7 | 21.27 - 22.05 in. | 55-56 cm |
| M | 7-1/8 - 7-1/4 | 22.06 - 22.83 in. | 57-58 cm |
| L | 7-3/8 - 7-3/4 | 22.84 - 23.62 in. | 59-60 cm |
| XL | 7-5/8 - 7-7/8 | 23.63 - 24.41 in. | 61-62 cm |
