Smith MAGâinterchangeable system, Includes bright light and low light ChromaPopâperformance lenses, Spherical carbonic-x lens, 5Xâanti-fog inner lens, TLT lens technology for crystal clear vision, Medium fit, Responsive Fitâframe design, QuickFit strap adjustment system with clip buckle, 3-layer DriWix face foam, Available in Asia Fit, Helmet compatible, Ultra-wide, silicone backed strap, Includes microfiber goggle bag with replacement lens sleeve, The I/O MAGâ utilizing the Smith MAGâinterchangeable system is designed for optimized performance and perfected fit: two locking mechanisms for lens security AirEvacâventilation for fog-free integration with Smith helmets and a frame designed for contoured face fit. All this technology is designed around one of Smithâ's largest spherical lenses providing a maximized field of view and 5Xâanti-fog technology. The I/O MAGâwas designed through a process of reducing elements to only the most essential so thereâ's nothing getting in the way of a great day on the mountain.