The IO Interchangeable Goggles are Smith's most innovative ski goggles designed specifically for women. An easy to use quick release lets you switch lenses, and Smith included a bonus lens so you can play with it right out of the box. Both impact and scratch resistant carbonic x lenses come in Smith's spherical design for the highest level of optical clarity. Smith also added a Porex filter to prevent optical distortion due to elevation, TLT lens technology for crystal clear vision, and a 5X anti fog inner lens that eliminates fogging better than the competition. The rimless frame features helmet compatibility, a QuickFit strap with a clip, and DriWix face foam for cushy comfort and moisture management.