Strike King ski plus sunglasses feature specifically designed tac (tri-acetate cellulose) polarized lenses for unequalled performance. The tac lenses are stable in all weather and humidity conditions and will never compromise in optical quality. The scientifically engineered lens colors will heighten the human eye's ability to clearly distinguish underwater structure and Fish while improving sharpness and contrast. Sk plus sunglasses feature apt (advanced polarization technology) that blocks 100% of harmful UVA and UVB rays protecting your eyes from the sun. State of the art coatings provide a clearer, non-distorted image. The ridged lens features advanced coatings that give the lens greater resistance to scratches while increasing optical performance.