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Adult Street Helmet Sizing: 

 
Helmet Size   SML
Head Circumference (cm)52 - 5656 - 6060 - 64
 

Adult Vio Helmet Sizing: 

 
Helmet Size   S/ML/XL
Head Circumference (cm)55 - 5959 - 62
 

Kids Helmet Sizing: 

 
Helmet Size   ToddlerYouth
Head Circumference (cm)48 - 5252 - 56