Strike King SK Plus Sunglasses are scientifically engineered to heighten the human eye's ability to clearly distinguish underwater structure and fish while improving sharpness and contrast. These TAC (tri-acetate-cellulose) lenses are stable in all weather and humidity conditions and will never compromise in optical quality. Advanced polarization in the lenses blocks 100% of harmful UVA and UVB rays to fully protect your eyes from the sun. A state-of-the-art, ridged lens coating gives the lenses greater resistance to scratches while increasing optical performance.