WOW Motorcycle Full Face Helmet Street Bike Matt Black, Size M (55-56 CM,21.7/22.0 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.