Native Eyewear Endura Interchageable Polarized Sunglasses plastic polycarbonate frame Polycarbonate lens non-Polarized 2" high 3" wide Interchangeable Polarized Lenses: Optical quality interchangeable impact-resistant lenses block 100% of the harmful UV light and eliminate glare for sharp, clear vision with increased contrast and depth perception Rhyno-Tuff Air Frames: A proprietary high-performance thermoplastic material that is extremely lightweight, yet durable enough to withstand high-velocity collisions and temperature extremes Cushinol Nose Pads and Temple Boots: The proprietary composition of Cushinol creates a non-slip grip that keeps sunglasses in place during athletic activity Venting: Exhaust vents incorporated into the design framework enhance airflow, virtually eliminating fog and condensation Unbeatable Lifetime Warranty: Includes scratched lenses