Helmet Size Circumference Centimeters Hat Size
(Of Your Head)
Small 21.65 - 22.05 " 55/56 6-7/8
Medium 22.44- 22.83" 57/58 7-1/8- 7-1/4
Large 23.23- 23.62" 59/60 7-3/8- 7-1/2
X-Large 24.02" 61 7-5/8
XX-Large 25-1/4" 62 7-7/8
