HJC CL-17 Redline Full-Face Motorcycle Helmet (MC-1, Small) Advanced Polycarbonate Composite Shell; Lightweight, superior fit and comfort using advanced CAD technology Anti-Scratch Pinlock ready Faceshield (HJ-09) New 3D design provides 95 percent U.V. protection; Side shield lock mechanism for a ultra-secure seal; For ultimate Anti-Fog system add a optional Pinlock insert (sold separately) RapidFire Shield Replacement System; Simple and secure shield ratchet system provides ultra-quick, tool-less removal and installation for efficient operation ACS Advanced Channeling Ventilation System; Full front to back airflow flushes heat and humidity up and out SuperCool Moisture-Wicking Interior; Fully removable cheek pads and liner; Anti-Bacterial Fabric; All sizes of cheek pads are interchangeable in all helmet sizes