Standard Sizing (CM)	Adjustable Sizing (CM)
JR S		51 - 55
JR M		55 - 58
XXS	53-54
XS	54-55
S	55-56	53-56
M	57-58	56-59
L	58-59	59-62
XL	60-61
XXL	61-62

 

Helmet sizing is determined by the distance around your head in centimeters.  Measure the circumference of your head just above your eyebrows to determine your correct helmet size.