Size Chart OUTSTAR, OUTSTAR S
| Size | Head (cm) | Head (Inches) | Hat size |
| S | 57 - 58 | 22 1/4 - 22 5/8 | 7 1/8 - 7 1/4 |
| M | 59 - 60 | 23 - 23 1/2 | 7 3/8 - 7 1/2 |
| L | 61 - 62 | 23 7/8 - 24 1/4 | 7 5/8 - 7 3/4 |
| XL | 63 - 64 | 24 5/8 - 25 | 7 7/8 - 8 |
| Size | Head (cm) | Head (Inches) | Hat size |
| S | 57 - 58 | 22 1/4 - 22 5/8 | 7 1/8 - 7 1/4 |
| M | 59 - 60 | 23 - 23 1/2 | 7 3/8 - 7 1/2 |
| L | 61 - 62 | 23 7/8 - 24 1/4 | 7 5/8 - 7 3/4 |
| XL | 63 - 64 | 24 5/8 - 25 | 7 7/8 - 8 |