To find your size for a helmet wrap a measuring tape around your head, just above your eyebrows and note the measurement at the point of overlap.
| Helmet Size | Small | Medium | Large | X-Large |
| Global Fit Circumference (cm) | 52-55 | 56-59 | 60-62 | 63-64 |
| Round Fit Circumference (cm) | 55-57 | 57-59 | 59-61 | - |
Suggested Goggle Pairing (X indicates suggested size pairing)
| M5 | X | X | ||
| M5S | X | X | X | |
| M4 Toric / Cylindrical | X | X | X | |
| M4S Toric / Cylindrical | X | X | ||
| M3 | X | X | ||
| WM3 | X | X | X | |
| WM1 | X | X | ||
| Sync | X | X | X | |
| Nesa | X | X | ||
| Helix 2.0 | X | X |








