Below is a size chart provided by Icon for this product.
| Helmet Size | Hat Size | Head Measurement (inches) | Head Measurement (cm) |
|---|---|---|---|
| XXS | 6 3/8 to 6 1/2 | 20 1/8 to 20 1/2 | 51 to 52 |
| XS | 6 5/8 to 6 3/4 | 20 7/8 to 21 1/4 | 53 to 54 |
| Small | 6 7/8 to 7 | 21 5/8 to 22 | 55 to 56 |
| Medium | 7 1/8 to 7 1/4 | 22 3/8 to 22 3/4 | 57 to 58 |
| Large | 7 3/8 to 7 1/2 | 23 1/8 to 23 1/2 | 59 to 60 |
| XL | 7 5/8 to 7 3/4 | 24 to 24 3/8 | 61 to 62 |
| XXL | 7 7/8 to 8 | 24 3/4 to 25 1/8 | 63 to 64 |
| XXXL | 8 1/8 to 8 1/4 | 25 1/2 to 26 | 65 to 66 |