Ideal for your active lifestyle, the Revo Descend E Polarized Sunglasses meld clean, sculpted lines with high-performance optics for a truly extraordinary pair of shades. Featuring an Eco-Use frame, these sunglasses transform castor bean oil into nylon for a more sustainable frame that's extremely lightweight and flexible. Ensuring these bad boys stay put when you're cruising on your boat or hiking down a craggy trail, the frame's Motion-Fit system optimizes the fit for stay-put performance, and there's an included detachable leash/buoy to ensure these don't fly off your head or sink to the bottom of the lake, should you drop 'em. Dialing in precision optics, the sunglasses' lightweight Serilium (polycarbonate) lens offers clear vision, especially on the water, with its high-contrast polarization and anti-reflective coating. In addition, the Element Shed (hydrophobic) coating keeps dirt, oil, and water from sticking to the lens when you're getting dirty on the trail or lake. Proposition 65 Warning for California Consumers: This product contains chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm.