Wiley X uses excellent materials and precision manufacturing to create every lens. All Wiley X lenses block 400 nanometers or 100% of the suns harmful UV rays. Each lens is made from pure shatterproof Selenite Polycarbonate and surpass ANSI Z87.1 safety and ANSI Z80.3 optical standards. They are then formulated and die-cut to eliminate distortion providing the perfect optical clarity.