Giro Helmet Size Guide

SUPER FIT™ HELMET SIZE	SIZE (CM)	SIZE (IN)
XS	47 - 51	18.5 - 20
S	51 - 55	20 - 21.75
M	55 - 59	21.75 - 23.25
L	59 - 63	23.25 - 24.75
XL	61 - 65	24 - 25.55

*The Large Quarter Bike Helmet is the following dimensions: Large: 23.25" - 24.25" / 59 - 61.5 cm

UNIVERSAL FIT HELMET SIZE	SIZE (CM)	SIZE (IN)
CHILD	50 - 55	19.75 - 21.75
YOUTH	50 - 57	19.75 - 22.5
ADULT	54 - 61	21.25 - 24
WOMEN	50 - 57	19.75 - 22.5
XL	58 - 65	22.75 - 25.5

YOUTH	SIZE (CM)	SIZE (IN)
S/M	46 - 50	18 - 19.75
M/L	50 - 54	19.75 - 21.5
TODDLER	48 - 52	18.75 - 20.5