HJC IS-MAX II Elemental Modular Motorcycle Helmet (MC-4, 4X-Large) Advanced Polycarbonate Composite Shell with Adjustable Polycarbonate Chinbar: Lightweight, superior fit and comfort using advanced CAD technology Single-Button One Handed Chin Bar/Face Shield Release Optically Superior Pinlock Faceshield (HJ-17): Provides 95 percent U.V. Protection; QuickSlide Tool-less Shield Replacement System; Pinlock Insert sold separately One-touch Integrated SunShield (HJ-V5): Smoke-tinted 3-stage adjustable SunShield with locking mechanism deploys quickly and easily; Multiple Optional SunShields available ACS Advanced Channeling Ventilation System: Full front to back airflow flushes heat and humidity up and out