The Icon Mainframe helmet was designed with the rider's safety, fit and function in mind. The Mainframe helmet features a venturi super-vent system for the ultimate in airflow. A three position dorsal switch acts as an additional ram-air vent to increase the overall cooling of the helmet. The shell is constructed of a (fiberglass/dyneema) blend and is lined with a dual density styrene liner for incredible strength without undue weight. Also incorporated into the design are removable/washable cheek pads, removable anti-fog breath deflector, and the industry's easiest no-tool quick change shield. Exceeds all DOT and Snell M2000 standards. Super-vent venturi cooling system. Secondary ram-air forehead vent. Strategically placed exhaust vent. Internal on/off chin exhaust switch offers control of escaping air. Positive-lock chin venting system helps prevent fogging. Side exhaust port works in conjunction with internal chin exhaust to release old air. ptically correct Polycarbonate, 7-position shield offers safe, clear vision and easy no-tool replacement system. Removablbreath deflector. Removable cheek pads with formed ear pockets that can accept communication or audio speakers.