When the moto gets intense, Bell's Velocity-Flow ventilation system moves tons of cool air in, and warm air out to keep you comfortable. The Bell MX 9 Helmet packs a moisture-wicking liner that is designed to channel air where you need it and is fully removable and washable. Features: MIPS Multi-Directional Impact Protection System for dramatically improved rotational impact energy displacement Lightweight polycarbonate shell 3 shell sizes SM: XS and SM Helmets MD: MD and LG Helmets LG: XL and 2XL Helmets Velocity-flow ventilation system for cooling and comfort Moisture wicking, removable/washable air channeled comfort liner EPS-lined chin bar Integrated vented roost guard Padded chin strap with D-ring closure and strap keeper DOT and ECE certified