Size Chart

Never buy a second-hand helmet or borrow someone else’s helmet.

Over time, the helmet’s protective padding conforms to the shape of the wearer’s head.

A used or borrowed helmet may not provide as much protection as a new one.

Helmet Size Conversion Chart

The size chart is provided for guidance only. Always try on the helmet and follow the instructions in this manual to ensure a proper fit.

Sizes	Centimeters	Cap Size	Inches
*3XS	50–51	6 1/4 – 6 3/8	19 3/4 – 20 1/8
2XS	52–53	6 1/2 – 6 5/8	20 1/2 – 20 7/8
XS	54–55	6 3/4 – 6 7/8	21 1/4 – 21 5/8
S	55–56	6 7/8 – 7	21 5/8 – 22
M	57–58	7 1/8 – 7 1/4	22 3/8 – 22 7/8
L	58–59	7 1/4 – 7 3/8	22 7/8 – 23 1/4
XL	60–61	7 1/2 – 7 5/8	23 5/8 – 24
2XL	62–63	7 3/4 – 7 7/8	24 3/8 – 24 3/4
3XL	64–65	8 – 8 1/8	25 1/8 – 25 1/2

*The C10 model is available in size 3XS (children’s size).

Available only for the Y10 and Y50 models.