1Storm Adult Motocross Helmet BMX MX ATV Dirt Bike Helmet Racing Style HF801 + Motorcycle Bluetooth Headset: Sonic Blue

Helmet Size Chart 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.

Ultra light weight durable aerodynamic thermoplastic alloy shell; Helmet comes with motorcycle Bluetooth headset as bundle (installation required); Beautiful glossy UV protective finish; Removable and washable padding; Motorcycle Bluetooth Headset supports up to 3 riders intercom, 800 meter communication, 10 hr phone talk time, 7 hr intercom talk and 300 hr standby time; Compatible with most mobile phone, Ipad, GPS audio via Bluetooth 3.0 technology; Easy one touch phone call, music playing, FM radio control; Heavily cushioned and comfortable interior; DOT Approved; DOT Approved;