1storm Motorcycle Street Bike Modular Flip Up Dual Visor Full Face Helmet Arrow Pink HB89 Size: Small

DOT Approved; Size S 53-54 CM20.9/21.3 Inch Advanced Modular/Flip up and Dual Lens Design inner smoked lens/outer clear shield; Light Weight Durable Aerodynamic Thermoplastic Alloy Shell Beautiful Arrow UV Protective Finish Removable and Washable Padding 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 XXL 61-62 CM 23.8/24.1 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.