Metric
| Size | Head Circumference (cm) |
| S | 48 - 54 |
| M | 54 - 58 |
| L | 59 - 61 |
Imperial
| Size | Head Circumference (in) |
| S | 18.90" - 21.56" |
| M | 21.56" - 22.83" |
| L | 23.23" - 24.02" |
K2 Varsity Skate Helmet Sizing Guide
Metric
| Size | Head Circumference (cm) |
| S | 48 - 54 |
| M | 54 - 58 |
| L | 59 - 61 |
Imperial
| Size | Head Circumference (in) |
| S | 18.90" - 21.56" |
| M | 21.56" - 22.83" |
| L | 23.23" - 24.02" |