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"