Joe Rocket RKT-Prime Motorcycle Helmet (Matte Black, X-Small) Superior fit and comfort using advanced 3D CAD technology; Flow-through advanced channeling ventilation system utilizing full front to back airflow, flushing heat and humidity up and out; Hat Size: 6-5/8 - 6-3/4 Superior Pinlock Face shield Provides 95 percent U.V. Protection (Pinlock Insert Sold Separately); RapidFire shield replacement system; Quick, secure, tool-less removal and installation 2-Stage shield closure mechanism compresses shield into eye port gasket providing an extremely secure seal Multiple optional shields available including RST mirrored, high definition (amber), smoke, gradient and race shields with tear-off posts; Easily converts to snowmobile application with optional Dual Lens or Electric Shield and Breath Guard Bioceramic Nylex moisture-wicking and odor reducing Interior; Removable and washable cheek pads and liner