All K2 lenses are double layer, spherical hard-coated lenses with industry leading anti-fog treatments, 100% UVA/B/C protection and Grade 1 certified optics. K2 Goggles use high performance lenses for enhanced vision and style. Many of our goggles feature Lenses by ZEISS complete with Ri-Pel coatings, a trusted optics brand and technology for maximum performance and field of vision in any condition. Lenses by ZEISS: The creators of the world’s most advanced optics bring their incredible quality and experience to the optics of K2 Goggles. Each lens is made of a tough polycarbonate and treated with a hard-coating for superior performance and extreme scratch resistance. sonar by ZEISS: A sophisticated lens tint designed specifically to offer maximum contrast and visibility across the largest possible range of light conditions. If you want one lens that works great in nearly all light conditions, look no further than our sonar Lenses by ZEISS.