Frame: TortoiseLens: HCL Bronze-Versatile In Changing Conditions With A Warm Tint.Lens Material: Polycarbonate - A Proprietary, Silicone-based Hard Coat That Protects Your Lenses. Glass Is Naturally Scratch Resistant But Polycarbonate Lenses Perform Better Longer With The Added Durability Of Our Optically Correct CLEARSHELL.Rx Power Range:+3.00 To -4.50