HJC RPHA-10 Pro Full-Face Motorcycle Helmet (Black, Medium) SNELL & D.O.T. Approved Advanced PIM (Premium Integrated Matrix) Construction: A matrix of Carbon Fiber, Aramid, Fiberglass and Organic Non-Woven Fabric create a remarkably strong yet extremely lightweight shell designed for superior fit and comfort using advanced CAD technology Max Air-Flow Top Vent: Variable air flow is adjusted by glove-friendly dials on each intake vent; RapidFire Shield Replacement System: Simple and secure shield ratchet system provides ultra-quick, tool-less removal and installation for efficient operation; HJ-20 Optically-superior Pinlock-prepared 2D Flat-Racing Shield: Our innovative Center one-touch open/close locking system is designed for an extremely secure seal;