Men's Fly Straight Sunglasses by Black Flys. 100% UV Protection. 6 Base Injected Frame. Comes with Black Flys zip case and microfiber soft bag. Black Flys nylon frames are constructed around a wire core, keeping the shape consistent in extreme conditions. They are injected of the highest quality nylon available and feature optical quality polycarbonate lenses. Polarized styles have shatter resistant polycarbonate lenses that offer maximum glare reduction and ultimate clarity.