Giro Helmets
XS
S
M
L
XL
XXL
Centimeters
52-53.5
53.5-55.5
55.5-57
57-59
59-60.5
60.5-62.5
Inches
20.5-21
21-21.75
21.75-22.5
22.5-23
23-23.75
23.75-24.5
Fitted Hat Size
6.5
6.75
7
7.25
7.5
7.75

 

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