Helmet Measurements:
- Measure circumference of head using fabric tape measure
- Measurement should be taken just above eyebrows and ears: Approximately 1" (25mm)
| D3 | Hat Size | Circumference (in) | Circumference (cm) |
| XS | 6-1/2 - 6-5/8" | 20-1/2 - 20-7/8" | 52 - 53cm |
| S | 6-3/4 - 6-7/8" | 21-1/4 - 21-5/8" | 54 - 55cm |
| M | 7 - 7-1/8" | 22 - 22-3/8" | 56 - 57cm |
| L | 7-1/4 - 7-3/8" | 22-3/4 - 23-1/4" | 58 - 59cm |
| XL | 7-1/2 - 7-3/4" | 23-5/8 - 24-3/8" | 60 - 62cm |
| 2XL | 7-7/8 - 8-1/8" | 24-3/4 - 25-5/8" | 63 - 65cm |
Note: All measurements are provided by the manufacturer and may vary depending on how measurements are acquired.