Leatt MTB Gravity 4. 0 Helmet Rated for the downhills, performance for the uphills For riders who thrive on the feeling of extreme days propelled by the forces of gravity, the Gravity 4. 0 by Leatt is an award-winning helmet that offers superior head protection with exceptional airflow to keep you cool on hot days. The ASTM downhill-certified Gravity 4. 0 boasts a durable, lightweight polymer outer shell, covering an impact-absorbing EPS and EPO foam core. For additional protection, Leatt's renowned 360deg Turbine Technology utilizes internal moving discs that lessen the forces from rotational impacts by up to 40% and concussive linear forces by up to 30%. The ample protection of the Leatt Gravity 4. 0 is paired with an easy-to-use Fidlock magnetic closure, a whopping 22 vents for an extreme amount of airflow, and a Dri-Lex(R) anti-odor moisture-wicking inner liner. All that protection in a lightweight, 850-gram full-face helmet, it's almost too good to be true. Features EPS + EPO impact foam core features excellent impact absorption properties Leatt's 360deg Turbine Technology reduces forces from both rotational and linear impacts Fidlock magnetic closuresystemfor quick, one-handed closure Removable mouthpiece vent cover for adjustable airflow and protection Breakaway visor to reduce rotational forces during impacts from awkward angles Neck brace compatibility for more comprehensive coverage and protection Dri-Lex(R) moisture-wicking liner is anti-odor to keep you dry and clean ride after ride ASTM Downhill-Certified polymer shell for certified protection on the most challenging trails Specifications Core Material EPS + EPO impact foam Safety Certifications AS/NZS 2063:2008, ASTM F1952-10, EN1078, CPSC 1203Intended Use Downhill, Freeride, Enduro, Bike Park Weight From 850 grams Sizing Size Small Medium Large XLHead circumference (cm)55 - 56cm57 - 58cm59 - 60cm61 - 62cm | Leatt | Helmet Mtb Gravity 4. 0 Men's | Size Extra Large In Black/grey