Net Weight 3.0 lb only, Extremely Light Weight Durable Genuine Carbon Fiber Composite Shell, Stronger and Lighter than ABS & Fiber Glass build; Advanced Face Cover Removal Design; Top ventilation control & 3-position ventilation channel; Retractable front Visor provids more ventilation; Heavily cushioned and comfortable interior with Emergency Strape; Removable and Washable; Beautiful glossy UV protective finish; DOT approved; Helmet Size Chart

S 55-56 CM 21.7/22.0 Inch
M 57-58 CM 22.4/22.8 Inch
L 59-60 CM 23.2/23.4 Inch
XL 61-62 CM 23.8/24.1 Inch
XXL 63-64 CM 24.4/24.8 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.