Leatt Helmet MTB Trail 2. 0Open Face Head and Brain Protection The Leatt Helmet MTB Trail 2. 0 is a lightweight all-purpose MTB helmet for trail riding, cross-country training, and backcountry or gravel adventures. This helmet is well ventilated with Maxi Flow air channels, and the Dri-Lex liner is washable, moisture-wicking, anti-odor, and breathable. What is most important about the Leatt MTB 2. 0 helmet is the head and brain protection level it offers. Featuring 360 Turbine Technology, the helmet is lined with turbines, which are 360deg moving discs constructed from an energy-absorbing foam and material. This tech has two exclusive advantages, namely the reduction of rotational acceleration to the head and brain and the absorption of energy upon impact at concussion level. Features Maxi Flow impact foam air channels are effective even at low speeds Reduces peak brain rotational acceleration by up to 40%In-molded impact foam for greater energy absorption Visor with breakaway function for rotational impact force reduction Dri-Lex liner that wicks moisture, is breathable, and is anti-odor SPECIFICATIONSCore Material Impact Foam Closure system Leatt Dial Safety Certifications CPSCIntended Use Trail, XCWeight300g Sizing Size Small Medium Large Head Circumference (cm)51 - 55cm55 - 59cm59 - 63cm Head Circumference (in)20 - 21-5/8"21-5/8 - 23-1/4"23-1/4 - 24-3/4" | Leatt | Helmet Mtb Trail 2. 0 V24 Men's | Size Medium In Spinach