Smith MAGâinterchangeable system, Includes bright light and low light ChromaPopâperformance lenses, BirdsEye Vision, 5Xâanti-fog inner lens, TLT lens technology for crystal clear vision, Medium fit, QuickFit strap adjustment system with clip buckle, 3-layer DriWix face foam, Available in Asia Fit, Helmet compatible, AirEvacâintegration technology to reduce fogging, Ultra-wide, silicone backed strap, Includes goggle hardcase with microfiber bag., You can now see more than ever before. The all new 4D MAGâraises the bar for lens innovation with the introduction of BirdsEye Vision. This state of the art lens technology has a 25% increase of overall field of view compared to the I/O MAG. In addition we have evolved Smith MAGâby integrating the dual locking mechanisms into the goggle frame outriggers to make a quick and easy lens change system. We know that with BirdsEye Visionâfeaturing ChromaPopâlens technology youâ'll be able to see even more detail as you take on untracked territory.