1Storm Motorcycle Open Face Helmet Scooter Classical Knight Bike Dual Lens/Sun Visor + Spoiler + Motorcycle Bluetooth Headset: Glossy White

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 23.2/23.6 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.

DOT Approved; Size S (53-54 CM,20.9/21.3 Inch); Helmet comes with spoiler and motorcycle Bluetooth headset as bundle (installation required); Advance Dual Visors/Double Shields Design (inner smoked lens and optional outer clear, smoked or tinted lens); 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; Aerodyname Spoiler mounting helps helmet steady and stylish looking;