How to find your size ?

Please use a cloth tape to take your measurement. It is better to have a helper do the measuring in order to get accurate measurement. The circumference of the head should be measured at a point approximately one inch above the eyebrows, or at whatever point gives the largest possible measurement. If you find that your measurement falls between two sizes, choose the smaller size for this helmet.

XS - 50-51 cm 
S - 20 1/4 - 20 7/8" ( or 52-53 cm) 
M   - 21 - 21 5/8" ( or 54-55 cm) 
L   - 21 3/4 - 22 3/8" ( or 56-57 cm)
XL    - 22 1/2 - 23 1/8" ( or 58-59cm) 
2XL  - 23 1/4 - 24" ( or 60-61 cm)