HJC Treague Adult CS-R3 Street Motorcycle Helmet - MC-4F / Medium Advanced Polycarbonate composite Shell: lightweight, superior fit and comfort using advanced CAD technology HJ-09 face shield provides anti-scratch coating RapidFire Shield Replacement System simple and secure shield ratchet system provides ultra-quick, tool-less removal and installation for efficient operation 2-stage shield closure system with shield locking system for an extremely tight and secure seal ACS Advanced Channeling ventilation system with adjustable forehead and chin vents, and two rear exhaust vents creates a full front to back airflow flushing heat and humidity up and out