Alpinestars Helmet

 

Size CM IN
XS 53-54 20.8 – 21.2
SM 55-56 21.6 – 22
MD 57-58 22.4 – 22.8
LG  59-60 23.2 – 23.6
XL 61-62 24 – 24.4
XXL 63-64 24.8 – 25.2