Helmet Sizing
How to measure for proper helmet fit
Head measurements are used to ensure a comfortable and safe experience while wearing the helmet.
To measure head circumference, use a seamstress/tailor's tape measure or a piece of string with a roll tape measure. Wrap a tape measure or string around the forehead, level to the ground and around the largest point on the back of your head.
The measurement should be about one inch above the eyebrows. If you used a string, hold the point where it ended against the roll tape to find the measurement.
| Helmet Size | DOI | Hat Size | Inches | Centimeters |
|---|---|---|---|---|
| 2XS | S | 6 7/ 8 | Less than 21 3/ 4 | Less than 56 |
| XS | M | 7 | 21 3/4 to 22 1/ 8 | 56 - 57 |
| SM | - | 7 1/ 8 | 22 1/8 to 22 3/ 8 | 57 - 58 |
| MD | L | 7 1/ 4 | 22 3/8 to 22 3/ 4 | 58 - 59 |
| LG | - | 7 3/ 8 | 22 3/4 to 23 1/ 8 | 59 - 60 |
| XL | XL | 7 1/ 2 | 23 1/8 to 23 1/ 2 | 60 - 61 |
| 2XL | - | 7 5/ 8 | 23 1/2 to 24 | 61 - 62 |
| 3XL | 2XL | 7 3/ 4 | 24 to 24 3/ 8 | 62 - 63 |
| 4XL | - | 7 7/ 8 | 24 3/8 and UP | 63 and UP |
Note: Due to variations in head shape, not all the same measurements will result in the same size helmet configuration.