Native Eyewear Zodiac Polarized Sunglasses polarized Interchangeable Lens System Co-Injected Molding: Native frames now seamlessly incorporate their grippy, comfortable molding right into the plastic Rhyno-Tuff Air Frames: Made with proprietary high-performance thermoplastic material that is extremely lightweight, yet durable enough to withstand high-velocity collisions and temperature extremes Venting System: Exhaust vents are incorporated into the design framework to enhance airflow, and virtually eliminate fog and condensation, while strategically placed hybrid vents and side vents (available on select models) keep frames snugger on your face without compromising fit. This unique design feature is the only system available that allows maximum ventilation while blocking extraneous incoming light. Cushinol: Cushinol nose pads ensure a soft feel and custom fit, regardless of nose shape or size, and Cushinol temple boots create a non-slip grip to keep sunglasses in place during athletic activity