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Conversion Chart

HEAD SIZE INCHES HEAD SIZE CM HAT SIZE
21 ⅛ 54 6 ¾
21 ½ 55 6 ⅞
21 ⅞ 56 7
22 ¼ 57 7 ⅛
22 ⅝ 58 7 ¼
23 59 7 ½
23 ½ 60 7 ½
23 ⅞ 61 7 ⅝
24 ¼ 62 7 ¾
24 ⅝ 63 7 ⅞
25 64 8
25 ½ 65 8 ⅛

Disclaimer: This conversion chart is a guide only and does not constitute a guarantee as to the fit of the helmet. Some people may have a unique head shape changing what size they need. Some helmets fit different shaped heads better than others.