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Giro Helmet Size Chart

Adult Full Face Helmet
Size Circumference (cm)
XS 51 - 53
S 51 - 55
M 55 - 59
L 59 - 63
XL 61 - 65
Adult Open Face Helmet
Size Circumference (cm)
Universal Men 54 - 61
Universal Women 50 - 57
XS 47 - 51
S 51 - 55
M 55 - 59
L 59 - 63
XL 61 - 65
Insurgent Helmet
Size Circumference (cm)
XS/S 51 - 55
M/L 55 - 59
XL/2XL 59 - 63
Youth Helmet
Size Circumference (cm)
Universal 50 - 57
XS 45 - 49
S 49 - 53

Sizing information is provided by the manufacturer and does not guarantee a perfect fit. Please use this chart as a guide only.