The I/O MAG, utilizing the Smith MAG interchangeable system, is designed for optimized performance and perfected fit: two locking mechanisms for lens security, AirEvac 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 anti-fog technology. The I/O MAG 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.PRODUCT FEATURESSmith MAG interchangeable systemIncludes bright light and low light ChromaPop performance lensesSpherical carbonic-x lens5X anti-fog inner lensTLT lens technology for crystal clear visionMedium fitResponsive Fit frame designQuickFit strap adjustment system with clip buckle3-layer DriWix face foamAvailable in Asia fitHelmet compatibleUltra-wide, silicone backed strapArticulating outrigger positioning systemIncludes microfiber goggle bag with replacement lens sleeve