Measure around the widest part of your head just above the eyebrows.
| Helmet Size | CM | IN | Hat Size (IN) |
|---|---|---|---|
| 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 |
| 4XL* | 67–68 | 26 3/8" – 26 3/4" | 8 3/8 – 8 1/2 |