1Storm Motorcycle Bike Full Face Helmet Mechanic HJDJ11 + Motorcycle Bluetooth Headset: Carbon Fiber Black

<b>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 23.2/23.6 Inch <br> <br> <b>Helmet Size Tips</b> <br> <br>(1)Wrap a measuring tape around your head about a half-inch above eyebrows <br>(2)Take measurement two to three times to pick the largest one.

• Ultra light weight durable aerodynamic thermoplastic alloy shell; Helmet comes with motorcycle Bluetooth headset as bundle (installation required);
• 3 people intercom: Bluetooth 3.0 connectivity ranged in 800 meters; listen to and share music from phone, pad and phone calls with speed dialing; Advanced Waterproof, Dustproof and Sun Protection Design with FM Rideo;
• Large Battery Volume Ensures up to 120 hours Standby Time & Usable when Charging; 2 hours full charged; 8-10 hours intercom time;
• Removable and Washable Padding;
• Aerodynamic rear venturi-effect exhaust spoiler; DOT Approved;
• DOT Approved;