Our Sting Ray sunglasses are great for Juniors and small faces. They feature the half rim sports wraparound with rubber nose pads and rubber non-slip temple grips to create a snug fit. They are comprised of PC frames and TAC polarized lenses. Your order arrives packaged in a microfiber pouch which doubles as a cleaning cloth. PC is a frame construction made of Polycarbonates, a particular group of thermoplastic polymers. It also has trademark names like Lexan and Makroclear. These frames are lightweight, flexible, and are commonly used in sunglass construction. 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. Shiny Silver frames give that muted chrome look.. Smoke lenses keep colors neutral while the medium to dark gray, smoke tint blocks the sunlight. This results in less light reaching the eyes and makes bright sunlight easy on the eyes.