Sizing Chart

Helmet Size Hat Size Circumference (cm.) Circumference (in.)
X-Small -- 51 - 55.5 20" - 21.8"
Small 6 1/2 - 7 53.5 - 57 21" - 22.4"
Medium 7 - 7 3/8 56 - 59.5 23" - 23.4"
Large 7 1/2 - 7 7/8 59.5 - 64 23.5" - 25.2"