The I/O MAG(TM), utilizing Smith MAG(TM) lens change 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 around one of Smith's largest spherical lenses, providing a maximized field of view and 5X anti-fog technology.Smith MAG(TM) lens change systemIncludes bright light and low light performance lensesSpherical carbonic-x lensTLT lens technology for crystal clear visionPatented Porex filter prevents optical distortion during changes in elevationMedium fitQuickFit strap adjustment system with clip buckleAvailable in Asian fit5X anti-fog inner lens3-layer DriWix face foamHelmet compatibleAirEvac integration technology to reduce foggingUltra-wide, silicone backed strapDual-axis outrigger position systemIncludes microfiber goggle bag with replacement lens sleeve