| Small | Medium | Large | Extra Large | |
| Measurement 1: Middle of nose to behind ear (one side) | 5.1 - 5.8 " | 5.9 - 6.6 " | 6.7 - 7.4 " | 7.5 - 8.2 " |
| Measurement 2: Middle of nose to just under chin (max.) | 4.3 - 4.3 " | 4.9 - 4.9 " | 5.5 - 5.5 " | 6.1 - 6.1 " |
Middle of nose to behind ear (one side)
Middle of nose to just under chin