How to measure your face size
Guide: This model's face size is 20 (Regular)
| Face Size | Face Opening (in inches) |
| 19.5 (Petite) | 19.5 |
| 20 (Regular) -- fits most | 20 |
| 20.5 (Regular) -- fits most | 20.5 |
| 21 (Plus) | 21 |
| 21.5 (Plus) | 21.5 |
Note: If you are unsure of your face size, choose 'Regular' (either 20 or 20.5) which fits most people.