1storm Motorcycle Bike Full Face Helmet Mechanic Glossy Black Smoked Shield Men’s Size: Medium

Ultra light weight durable aerodynamic thermoplastic alloy shell; 3-level top ventilation control and 5-position ventilation channel; Heavily cushioned and comfortable interior Removable and washable; Beautiful glossy UV protective finish; Aerodynamic rear venturi-effect exhaust spoiler; DOT Approved; Helmet Size Chart /b br br S 53-54 CM 20.9/21.3 Inch br M 55-56 CM 21.7/22.0 Inch br L 57-58 CM 22.4/22.8 Inch br XL 59-60 CM 23.2/23.4 Inch br br Helmet Size Tips /b br br 1Wrap a measuring tape around your head about a half-inch above eyebrows br 2Take measurement two to three times to pick the largest one.