Exquisite details, See the quality in detail, giving you a more comfortable riding experienceBack diversion designStreamlined design reduces wind resistance and makes riding smootherMouth ventVentilation to keep the inside of the helmet cool and comfortableTop air duct switchConvenient, fast, smooth switch, convenient for riding needs in different environmentsCool personality tailFashion and cool shape, streamlined design, reduce wind resistanceBluetooth Description4.2 Bluetooth solution calls can automatically answer 500А high-capacity battery standby time 120 hours continuous listening to music for more than 20 hours。Host: waterproof. It's not easy to use it when it's raining, it's detachable and the SR Bluetooth chip has a built-in functional bass surround.Product specificationType: full face helmetShell material: ABSLining: high density EPS buffer layerProduct weight: 1420 gramsSize: L = 59-60CM, XL = 61-62CM,XXL=63-64Please allow 1-3cm as the error range of manual measurement.Package contains1 * Bluetooth Motorcycle Helmet