Helmet Measurements:
- Measure around head one inch above the eyebrows and across the largest portion on the back of the head.
| U.S. Hat Size | Circumference (in) | Circumference (cm) | |
| Youth S | 5-7/8 - 6 | 18.25 - 19" | 47 - 48cm |
| Youth M | 6-1/8 - 6-1/4 | 19.00 - 19.75" | 49 - 50cm |
| Youth L | 6-3/8 - 6-1/2 | 19.75 - 20.5" | 51 - 52cm |
| XS | 6-5/8 - 6-3/4 | 20.5 - 21.25" | 53 - 54cm |
| S | 6-7/8 - 7 | 21.25 - 22" | 55 - 56cm |
| M | 7-1/8 - 7-1/4 | 22 - 23" | 57 - 58cm |
| L | 7-3/8 - 7-1/2 | 23 - 23.75" | 59 - 60cm |
| XL | 7-5/8 - 7-3/4 | 24 - 24.5" | 61 - 62cm |
| 2XL | 7-7/8 - 8 | 24.5 - 25.25" | 63 - 64cm |
| 3XL | 8-1/8 - 8-1/4 | 25.25 - 26" | 65 - 66cm |
| 4XL | 8-3/8 - 8-1/2 | 26 - 26.75" | 67 - 68cm |
| 5XL | 8-5/8 - 8-3/4 | 26.75 - 27.5" | 69 - 70cm |