Size Guide | Oakley Helmets
HOW TO MEASURE
Have a tape at hand and follow our instructions to measure one parameter as suggested below:
| Size | Circumference (cm) |
| Small | 51-55 |
| Medium | 55-59 |
| Large | 59-61 |
| Extra large | 61-63 |
| Size | Circumference (cm) |
| Small | 51-55 |
| Medium | 55-59 |
| Large | 59-61 |
| Extra large | 61-63 |
