Evolution Head Gear Size Chart
| Size | Head Circumference (cm) | Head Circumference (in) |
| Small | 47 - 52 cm | 18.50" - 20.50" |
| Medium | 53 - 57 cm | 20.875" - 22.50" |
| Large | 58 - 64 cm | 22.75" - 25.25" |
| Wrap a flexible measuring tape around your head just above the brow bone | ||