509 Helmets Size Chart
509 ADULTS' Helmets Sizing Guide
| Size | US Hat Size | Head INCHES Circumference | Head CENTIMETERS Circumference |
|---|---|---|---|
| XS | 6 5/8 - 6 3/4 | 20 7/8 - 21 1/8 | 53 - 54 |
| S | 6 7/8 - 7 | 21 5/8 - 21 7/8 | 55 - 56 |
| M | 7 1/8 - 7 1/4 | 22 1/2 - 22 5/8 | 57 - 58 |
| L | 7 3/8 - 7 1/2 | 23 1/4 - 23 1/2 | 59 - 60 |
| XL | 7 5/8 - 7 3/4 | 24 - 24 1/4 | 61 - 62 |
| 2XL | 8 | 24 3/4 - 25 | 63 - 64 |
| 3XL | 8 3/4 | 25 1/4 - 25 3/4 | 64 - 65 |
| 4XL | 9 | 26 - 26 1/4 | 66 - 67 |
509 KIDS' Helmets Sizing Guide
| Size | US Hat Size | Head INCHES Circumference | Head CENTIMETERS Circumference |
|---|---|---|---|
| Y S | 6 | 18 1/8 - 18 7/8 | 47 - 48 |
| Y M | 6 1/8 - 6 1/4 | 19 1/4 - 19 5/8 | 49 - 50 |
| Y L | 6 3/8 - 6 1/2 | 20 - 20 1/2 | 51 - 52 |
HOW TO MEASURE:
Head Circumference:
Measure the head just above the top of the ears and eyebrows.
