Tabulka velikostí helem HJC
| Velikost | Obvod hlavy v cm |
| XXS | 51-52 |
| XS | 53-54 |
| S | 55-56 |
| M | 57-58 |
| L | 59-60 |
| XL | 61-62 |
| 2XL | 63-64 |
| 3XL | 65-66 |
| 4XL | 67-68 |
| 5XL | 69-70 |
| Youth S | 49-50 |
| Youth M | 51-52 |
| Youth L | 53-54 |
| Youth S/M | 49-50 |
| Youth L/XL | 51-52 |
Řada RPHA, FG-Jet, FG-17
| Velikost | Obvod hlavy v cm |
| XS | 54-55 |
| S | 55-56 |
| M | 57-58 |
| L | 58-59 |
| XL | 60-61 |
| 2XL | 62-63 |
| 3XL | 64-65 |