Find your Size: Wrap measuring tape around your head, just above your eyebrows, note your size at the point of overlap.
Note: All measurements are in centimeters unless otherwise noted

Smith Adult Helmet Sizing

Size S M L XL
Centimeters 51-55 55-59 59-63 63-67

Smith Youth Helmet Sizing

Size S M
Centimeters 48-53 53-58