Bell Full-10 Spherical Helmet Transcendant protection Building off of the extremely popular Full-9, the updated Bell Full-10 Spherical Helmet further raises the bar on what we should expect from a full-face helmet. With the newly-designed Thermal Exchange Airfl w System (T. E. A. S. ), Bell has engineered a ventilation system that sucks in cool air, then vents hot air out the sides of the helmet, providing unmatched airflow and sweat management. The unidirectional carbon outer shell is ultra-lightweight, while the progressively-layered core absorbs impact forces. Featuring a panoramic goggle port, the Full-10 is compatible with your favorite pair of oversized goggles, while an adjustable Flying Bridge(TM) Visor adds coverage and protection. The pinnacle of modern downhill helmet technology, performance, and safety, the Full-10 Spherical is hard to beat. Features Spherical(TM) technology powered by MIPS(R) uses a ball-and-socket design to allow the inner and outer liners to rotate independently during a crash, reducing rotational forces on the brain Unidirectional carbon fiber shell for the material's weight savings and modern design capabilities Thermal Exchange Airfl w System (T. E. A. S. ) uses a vacuum-like system to suck in cool air through the 16 total front vents, while pushing hot air out of the 5 rear outflow vents for ultimate cooling power Panoramic goggle port is compatible with your favorite pair of oversized goggles Ionic+(TM) Antimicrobial Comfort Padding dries quickly, wicks away moisture, and limits odor Flying Bridge(TM) breakaway visor for adjustable coverage, with replaceable bolts (just in case)SPECIFICATIONSCore Material Progressively-Layered EPS Foam Safety Certifications NTA 8776 (e-bike), CPSC Bicycle, CE EN 1078:2012, ASTM F1952-15 DH, ASTM F2032-15 BMX, Weight1000g (Size M)Intended Use Enduro, Downhill Sizing Helmet Size XS/Small Medium Large XL/XXLHead Circumference (cm)51 - 55cm55 - 57cm57 - 59cm59 - 63cm | Bell | Full-10 Spherical Helmet Men's | Size Extra Large/xx Large In Matte Black