Shoei Helmets Size Chart
| Size | Centimeters | Inches | Hat Size |
|---|---|---|---|
| 2XS | 51 - 52 | 20 1/8 - 20 1/2 | 6 3/8 - 6 1/2 |
| XS | 53 - 54 | 20 7/8 - 21 1/4 | 6 5/8 - 6 3/4 |
| S | 55 - 56 | 21 5/8 - 22 | 6 7/8 - 7 |
| M | 57 - 58 | 22 1/2 - 22 7/8 | 7 1/8 - 7 1/4 |
| L | 59 - 60 | 23 1/4 - 23 5/8 | 7 3/8 - 7 1/2 |
| XL | 61 - 62 | 24 - 24 3/8 | 7 5/8 - 7 3/4 |
| 2XL | 63 - 64 | 24 3/4 - 25 1/8 | 7 7/8 - 8 |
| 3XL | 65 - 66 | 25 5/8 - 26 | 8 1/8 - 8 1/4 |