Bike & Action Sports Helmet Sizing
Adult
| Head Circumference | XS | S | M | L | XL | Universal |
| Imperial | 20.5"-21" | 21"-21.75" | 21.75"-22.5" | 22.5"-23" | 23.75"-24.75" | 21.25"-24" |
| Metric | 52cm-53.5cm | 53.5cm-55.5cm | 55.5cm-57cm | 57cm-59cm | 59cm-61cm | 54cm-61cm |
Junior
| Head Circumference | Toddler | S | M | Universal |
| Imperial | 18.5"-20.5" | 19.75"-21.75" | 21.5"-22.75" | 19.5"-22.5" |
| Metric | 47cm-52cm | 50cm-55cm | 54.5cm-58cm | 50cm-58cm |
