The I/O MAG(TM), utilizing the Smith MAG(TM) interchangeable system, is designed for optimized performance and perfected fit: two locking mechanisms for lens security, AirEvac(TM) ventilation for fog-free integration with Smith helmets, and a frame designed for contoured face fit. All this technology is designed around one of Smith's largest spherical lenses, providing a maximized field of view and 5X(TM) anti-fog technology. The I/O MAG(TM) was designed through a process of reducing elements to only the most essential, so there's nothing getting in the way of a great day on the mountain. Vision: Smith MAG lens change system uses MAGnets for quick, easy lens changes Spherical Carbonic-x lens for distortion-free optics and impact resistance 5X(TM) anti-fog inner lens for advanced fog-free performance ChromaPop(TM) enhances contrast and natural color to make the details pop Fit & Integration: Designed for ultimate integration with Smith helmets for maximum comfort Venting and fog-free performance Three-layer DriWix face foam wicks moisture for a fog-free fit Ultra-wide, silicone-backed strap stays put Silicone-backed strap stays put Includes Two lenses: Bright light and low light ChromaPop(TM) performance tints, gogglesoc(TM)