Coyote Eyewear PZS-39LG Handmade Frame Polarized Sunglasses Handmade Italian Zyl frames with spring hinges for comfortable fit.durability Premium quality polarized polycarbonate lens for maximum glare reduction Stainless steel components for added strength 5 layer lens - double hard coated Gray tint offers natural color transmission and a cooling view; Copper tint offers excellent contrast in wide range of lighting conditions