1Storm Motorcycle Modular Full Face Flip up Dual Visor Helmet + Spoiler + Motorcycle Bluetooth Headset: HJK316 Glossy 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.

• DOT Approved; Size M (55-56 CM,21.7/22.0 Inch); Helmet comes with spoiler and motorcycle bluetooth headset as bundle (installation required);
• Advanced Modular/Flip up and Dual Lens Design (inner smoked lens/outer clear shield);
• 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;