Our Pipeline sunglasses feature a medium rectangular TR90 frame and TAC polarized lenses. Your order arrives packaged in a microfiber pouch which doubles as a cleaning cloth. TR90 is a super-polymer compound that is extremely lightweight, incredibly sturdy, but very flexible. TAC is the acronym for Tri Acetate Cellulose used in lens construction. These lenses are comprised of a scratch resistant plastic and block out 99% of all UV rays up to 400 nanometers. Matte Black frames are one of the most popular frame colors in sunglasses and are never out of style. Mirrored Smoke Blue lenses are made by coating thin layers of titanium and silicon oxides in various volumes to modify tint. It can eliminate up to 97% of infrared rays, in particular in the blue spectrum to enhance color.