Leatt MTB All Mtn 4. 0 V23 Helmet All Mtn. All The Time. With deep coverage, especially at the back of the head, the Leatt All Mtn 3. 0 V23 offers serious protection for increasingly technical rides. Sitting at the top of Leatt's All Mountain helmet lineup, the All Mtn 4. 0 V23 features exceptional ventilation through 18 vents, including a sunglasses dock port to stow your glasses mid-ride. This helmet boasts deep coverage for added safety, and like all Leatt helmets, the All Mtn 4. 0 V23 features Leatt's 360deg Turbine Technology-a series of energy-absorbing discs and reduces concussive forces by up to 30%, and rotational forces by up to 40%. When the trails get gnarly, it's time to get the All Mtn 4. 0 V23 Helmet from Leatt. Features Lightweight polymer outer shell for durability with minimal weight In-molded EPS + EP0 impact foam core expertly absorbs harmful forces from impacts Leatt's 360deg Turbine Technology reduces forces from both rotational and linear impacts Fidlock magnetic closure system for easy-to-use and reliable closure18 vents keep the air flowing at any speed Washable, moisture-wicking inner liner with anti-odor properties to keep you fresh ride after ride Adjustable breakaway visor for adjustable coverage that reduces the risk of rotational impact forces during certain crashes Specifications Core Material In-molded EPS + EP0 impact foam Safety Certifications AS/NZS 2063:2008, EN1078, CPSC 1203, ASTM F1952-15Intended Use All Mountain, Trail Weight~430 grams Sizing Size Small Medium Large Head circumference (cm)51 - 55cm55 - 59cm59 - 63cm | Leatt | Mtb All Mtn 4. 0 V23 Helmet Men's | Size Large In Stealth