Leatt Helmet MTB Enduro 2. 0Best Of Both Worlds The Leatt Enduro 2. 0 helmet is built for riders who prefer the freedom of a half shell, but want the option of added coverage when the trail gets rowdy. The removable chin bar attaches easily with a push-button system, offering extra protection when you need it, and staying out of the way when you don't. Leatt's 360deg Turbine Technology helps reduce rotational forces and absorb low-speed impact energy, while in-molded impact foam adds protection against high-speed crashes, working together as a 3-in-1 safety system. With 20 vents for consistent airflow, a breathable liner, and a Fidlock magnetic buckle for easy on and off, the Enduro 2. 0 is lightweight, versatile, and ready for trail rides and sessioning the techy lines. Features3-in-1 safety system protects against low-speed impacts, high-speed impacts, and rotational forces Optimally designed turbine discs enable the helmet to move slightly on the head upon impact, helping to reduce peak acceleration to the head & brain20 vents that are effective even at low speeds SPECIFICATIONSCore Material Impact Foam Closure system Leatt Fit System Safety Certifications AS/NZS 2063:2008, EN1078, CPSC 1203 * Chin bar passes ASTM impact testing Intended Use Enduro Weight With chin bar: from 690g (1. 52 lbs) / Without chin bar: from 360g (0. 79 lbs)Sizing Size Small Medium Large Head Circumference (cm)51 - 55cm55 - 59cm59 - 63cm | Leatt | Helmet Mtb Enduro 2. 0 Men's | Size Small In Brown