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| Size | Hat Size | Inches | Centimeters |
| Youth Small | 18-1/2 - 18-7/8 | 47-48 | |
| Youth Medium | 19-1/4 - 19-5/8 | 49-50 | |
| Youth Large | 20 - 20-1/2 | 51-52 | |
| X-Small | 6-5/8 - 6-3/4 | 20-7/8 - 21-1/4 | 53-54 |
| Small | 6-7/8 - 7 | 21-5/8 - 22 | 55-56 |
| Medium | 7-1/8 - 7-1/4 | 22-3/8 - 22-3/4 | 57-58 |
| Large | 7-3/8 - 7-1/2 | 23-1/8 - 23-3/4 | 59-60 |
| X-Large | 7-5/8 - 7-3/4 | 24 - 24-3/8 | 61-62 |
| 2X-Large | 7-7/8 - 8 | 24-3/4 - 25-1/8 | 63-64 |
Nikko Helmets Size Chart
Posted by Aaron Golshen on