The Smith I/O has been one of the forerunners in interchangeable lens technology in the goggle universe. The Quick Release Lens Change System allows you to swap out your goggle in a few minutes when the light changes on you. This season the I/O uses Smith's new Chromapop Lens that improves the clarity and definition of the snow texture allowing you to ride better. A Spherical Carbonic-X Lens has been treated with 5X Anti-Fog Coating and a Porex Filter to deliver an undistorted, wide field of vision, even at altitude. AirEvac Technology keeps air moving through the frame to aid in fog prevention. 3-Layers of DriWix Face Foam keep a tight seal across your face while being able to wick moisture away if you start to sweat. Smith's Responsive Fit Frame easily adapts to most face shapes once you adjust the Silicone Backend Strap. If you want crystal clear mountain views and while being able to determine the texture of the snow, in a pioneer in quick lens change systems, the Smith I/O is the goggle for you. Chromapop Lens, Quick Release Lens Change System, Spherical Carbonic-X Lens, 5X Anti-Fog Coating, TLT Lens Technology, Porex Filter, Responsive Fit Frame, Quick Fit Strap Adjustment, 3-Layer DriWix Face Foam, Articulating Outrigger System, AirEvac Integration Technology, Race: No, Category: Adult, OTG: No, Helmet Compatible: Yes, Spare Lens Included: Yes, Goggle Ventilation: High, Goggle Lens Change: Easy, Frame Size: Medium, Lens Shape: Spherical, Lens Type: Non-Mirrored, Model Year: 2019, Product ID: 494200, Model Number: II7CPBBO18, GTIN: 0715757550127