1Storm Motorcycle Full Face Helmet Skull King Matt Green+ One Extra Clear Shield, Size Large (57-58 Cm,22.4/22.8 Inch)

Helmet Size Chart
S 53-54 CM 20.9/21.3 Inch
M 55-56 CM 21.7/22.0 Inch
L 57-58 CM 22.4/22.8 Inch
XL 59-60 CM 23.2/23.4 Inch
XXL 61-62 CM 23.8/24.1 Inch
Helmet Size Tips
(1)Wrap a measuring tape around your head about a half-inch above eyebrows
(2)Take measurement two to three times to pick the largest one.