Arai - Helmet Sizing
| Order size | Head circumference |
|---|---|
| 3XS | 49-50 |
| XXS | 51-52 |
| XS | 53-54 |
| S | 55-56 |
| M | 57-58 |
| L | 59-60 |
| XL | 61-62 |
| XXL | 63-64 |
| 3XL | 65-66 |
| Order size | Head circumference |
|---|---|
| 3XS | 49-50 |
| XXS | 51-52 |
| XS | 53-54 |
| S | 55-56 |
| M | 57-58 |
| L | 59-60 |
| XL | 61-62 |
| XXL | 63-64 |
| 3XL | 65-66 |