Men's / Women's
| Head Circumference | |
| One Size | 21 - 23.5 in / 53 - 60 cm |
| S/M | 21 - 22.5 in / 53 - 57 cm |
| L/XL | 22.5 - 23.5 in / 57 - 60 cm |
Kids'
| Age | Head Circumference | |
| One Size | 3Y - 12Y | 20 -22 in / 51 - 58 cm |
| S | 3Y - 6Y | 20 - 21 in / 51 - 53 cm |
| M | 6Y - 12Y | 21 - 22 in / 53 - 56 cm |
