X1 Alpha Helmet
| HEAD CIRCUMFERENCE (cm) | 53-54 | 55-56 | 57-58 | 59-60 | 61-62 | 63-64 | 65-66 | |
| HELMET SIZE | XS | S | M | L | XL | 2XL | 3XL | |
| SHELL SIZE | M | L | XL | |||||
| EPS SIZE | S | M | L | XL | 3XL | |||
| COMFORT LINER* | XS | S | M | L | XL | 2XL | 3XL | |
| CHEEK PAD SIZES** | XS - 40mm | S - 35mm | M - 40mm | L - 35mm | XL - 35mm | 2XL -30mm | 3XL -25mm | |
* Comfort liners are color coded to the EPS that they fit into.
**ALL cheekpads are interchangable between all sizes:
- REDUCTION SIZE (BELOW XS): 45mm
- EXPANSION SIZE (ABOVE 3XL): 20mm