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 Standard Sizing (CM)Adjustable Sizing (CM)
JR S 51 - 55
JR M 55 - 58
XXS53-54 
XS54-55 
S55-5653-56
M57-5856-59
L58-5959-62
XL60-61 
XXL61-62 
 
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.