1Storm Motorcycle Street Bike Modular/Flip up Dual Visor/Sun Shield Full Face Helmet: HG339

Features DOT Approved; Advanced Modular/Flip up and Dual Lens Design (inner smoked lens/outer clear shield); Light Weight Durable Aerodynamic Thermoplastic Alloy Shell Beautiful Glossy UV Protective Finish Removable and Washable Padding   Technical Details Brand: 1Storm Model: HG339 Item Weight: 5 pounds Manufacturer Part Number: HG339 CAPA Certified: DOT Certified Vehicle Service Type: street bike   Helmet Size Chart  XS 51-52 CM 20.1/20.5 Inch  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.