HJC (CL-17) MC-5F Helmet (Mission, Medium) Advanced Polycarbonate Composite Shell: Lightweight, superior fit and comfort using advanced CAD technology Optically Superior Pinlock ready face shield: New 3D design provides 95 percent UV protection, an anti-scratch coating and is prepared for the ultimate anti-fog Pinlock insert; Pinlock insert sold separately RapidFire Shield Replacement System: Quick, secure, tool-less removal and installation ACS-Advanced Channeling Ventilation System: Full front to back airflow flushes heat and humidity up and out