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CCM Tacks 110 Combo Helmet Size Guide

Size	Head circum. (IN)	Head circum. (CM)
XS	19.7 - 21.3"	50 -54 cm
S	20 - 22"	51 - 56 cm
M	21.7 - 23.2"	55 - 59 cm
L	22.4 - 24.4"	57 - 62 cm