Featuring SONAR lens technology by ZEISS the Anon M2 Goggles rimless design and quality optics that mimics the curvature of the human eye will give you clear, Wall-to-Wall vision all over the mountain. Anon\'s easy to use Magna-Tech quick lens change technology using 16 powerful neodymium magnets makes switching lenses easy, you can even change them without taking the goggles off first. A spare Greybird lens is also included for low light conditions. Full perimeter venting ensures that the Anon M2 remains fog free and the triple layer face foam offers additional comfort.Anon M2 Goggle Features:   Magna-Tech Quick Lens Change Technology Anon Spherical Lens Technology Wall-To-Wall Vision Full Perimeter Channel Venting Flush Mount Outrigger Triple Layer Face Foam Lightweight Frame Main Lens SONAR Smoke Spare Lens SONAR Blue Goggle Case and Microfibre Goggle