The I/O MAG™, utilizing the Smith MAG™ interchangeable system, is designed for optimized performance andperfected fit: two locking mechanisms for lens security, AirEvac™ ventilation for fog-free integration with Smithhelmets, and a frame designed for contoured face fit. All this technology is designed around one of Smith’s largestspherical lenses, providing a maximized field of view and 5X™ anti-fog technology. The I/O MAG™ was designedthrough a process of reducing elements to only the most essential, so there’s nothing getting in the way of a greatday on the mountain.