HJC RPHA 10 Pro Helmet Max Air-flow Top Vent: Variable air flow is adjusted by glove-friendly dials on each intake vent. Advanced P.I.M. (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 RapidFire Shield Replacement System: Simple and secure shield ratchet system provides ultra-quick, tool-less removal and installation for efficient operation DOT FMVSS 218 Certified