To determine the correct helmet size, wrap a measuring tape around your head, keeping the tape just above the ears and level front to back.
 
Superfit Helmet Size Size (cm) Size (in)
XS 47 - 51 18.5 - 20
S 52 - 55.5 20 - 21.75
M 55.5 - 59 21.75 - 23.25
L 59 - 62.5 23.25 - 24.5
XL 61 - 65 24 - 25.5
*The Large Quarter Bike Helmet is the following dimensions: Large: 23.25" - 24.35" / 59 - 61.5 cm
 
Universal Fit Helmet Size Size (cm) Size (in)
Toddler 46 - 50 18.25 - 19.75
Youth 50 - 55 19.75 - 21.75
Adult 54 - 61 21.25 - 24
XL 58 - 65 22.75 - 25.75
 
Youth Size (cm) Size (in) Youth Launch & Slingshot Size (cm)
S/M 46 - 50 18 - 19.75 XS/S 49 - 52
M/L 50 - 54 19.75 - 21.5 M/L 52 - 55.5
Toddler 48 - 52 18.75 - 20.5