Size Chart STRYKER
| Size | Head (cm) | Head (Inches) | Hat size |
| S | 55 - 56 | 21 1/2 - 21 7/8 | 6 7/8 - 7 |
| M | 57 - 58 | 22 1/4 - 22 5/8 | 7 1/8 - 7 1/4 |
| L | 58 - 59 | 22 5/8 - 23 | 7 3/8 - 7 1/2 |
| XL | 60 - 61 | 23 1/2 - 23 7/8 | 7 5/8 - 7 3/4 |
| XXL | 62 - 63 | 24 1/4 - 24 5/8 | 7 7/8 - 8 |
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| Size | Head (cm) | Head (Inches) | Hat size |
| S | 55 - 56 | 21 1/2 - 21 7/8 | 6 7/8 - 7 |
| M | 57 - 58 | 22 1/4 - 22 5/8 | 7 1/8 - 7 1/4 |
| L | 58 - 59 | 22 5/8 - 23 | 7 3/8 - 7 1/2 |
| XL | 60 - 61 | 23 1/2 - 23 7/8 | 7 5/8 - 7 3/4 |
| XXL | 62 - 63 | 24 1/4 - 24 5/8 | 7 7/8 - 8 |