Giro Helmet Size Chart

Wrap a soft tape measure around your head, keeping it level from front to back, just above your ears and eyebrows. Note the measurement and find your size below. The helmet should fit with a little room when the fit system is loosened, and sit low enough to protect your forehead without blocking your vision. Once you have the right size, dial in the fit with the adjustment system.

Adult helmets

Size	Head circumference	Approx. inches
S	52 – 55.5 cm	20.5 – 21.9 in
M	55.5 – 59 cm	21.9 – 23.2 in
L	59 – 62.5 cm	23.2 – 24.6 in
XL	62.5 – 65 cm	24.6 – 25.6 in

Race helmets

Size	Head circumference	Approx. inches
XS	52 – 53.5 cm	20.5 – 21.1 in
S	53.5 – 55.5 cm	21.1 – 21.9 in
M	55.5 – 57 cm	21.9 – 22.4 in
L	57 – 59 cm	22.4 – 23.2 in
XL	59 – 60.5 cm	23.2 – 23.8 in
XXL	60.5 – 62.5 cm	23.8 – 24.6 in

Youth helmets

Size	Head circumference	Approx. inches
XS	48.5 – 52 cm	19.1 – 20.5 in
S	52 – 55.5 cm	20.5 – 21.9 in
M	55.5 – 59 cm	21.9 – 23.2 in

Based on Giro's official snow helmet size guide (centimeters). Inches are converted and rounded; when you are between sizes, go by the centimeter measurement. Questions? Give us a call and we'll help you find the right fit.