Measurements below are head circumference. Use a flexible tape measure and wrap it around your head just at the top of the brow and around the temples.
| Size | Inches | CM |
|---|---|---|
| S | 6.25-6.75 | 51-55 |
| M | 6.875-7.875 | 55-59 |
| L | 7.5-7.875 | 59-63 |
| Size | Inches | CM |
|---|---|---|
| S | 6.25-6.75 | 51-55 |
| M | 6.875-7.875 | 55-59 |
| L | 7.5-7.875 | 59-63 |