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Helmet Size Chart

HELMET SIZE HEAD CIRC. (IN) HEAD CIRC. (CM) HAT SIZE
XX-Small 20" - 20 1/2" 51cm - 52cm 6 3/8" - 6 1/2"
X-Small 21 1/4" - 21 5/8" 54cm - 55cm 6 3/4" - 6 7/8"
Small 21 5/8" - 22" 55cm - 56cm 6 7/8" - 7"
Medium 22 1/2" - 22 3/4" 57cm - 58cm 7 1/8" - 7 1/4"
Large 22 3/4" - 23 1/4" 58cm - 59cm 7 1/4" - 7 3/8"
X-Large 23 5/8" - 24" 60cm - 61cm 7 1/2" - 7 5/8"
XX-Large 24 1/2" - 24 3/4" 62cm - 63cm 7 3/4" - 7 7/8"