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Giro Helmet Sizing Chart 
  
Adult Sizes in cm
XS 20.5 - 21 52 - 53.5
S 21 - 21.75 53.5 - 55.5
M 21.75 - 22.5 55.5 - 57
L 22.5 - 23 57 - 59
XL 23 - 23.75 59 - 60.5
XXL 23.75 - 24.5 60.5 - 62.5
     
Youth Sizes    
XS/S  19 - 21 49 - 54
M/L  21 - 23 54 - 58 
XS  20.5 - 21 52 - 53.5 
S  21 - 22 53.5 - 55.5 
M  22 - 22.5 55.5 - 57 
L  22.5 - 23 57 - 59 

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.