Yellow Polycarbonate: Provides Ultra Violet 400 protection against the suns damaging rays while enhancing visual clarity in low light conditions. These enhancing canary yellow clip-on flip-ups allow 54% light transmission and heightens contrast. They provide maximum brightness and good visual acuity. Our patented all metal G and D Flip Ups, teamed up with our shatter proof , lightweight polycarbonate lenses, providing the avid sportsman and outdoorsman, needing visual clarity while wearing your prescription eyewear. Our flip up design provides you with superior sport sunglass protection, providing 100% Ultra Violet protection while Golfing, shooting or just driving in your car.