Native Eyewear's Polarized Hardtop Ultra Interchangeable Sunglasses combine performance-driven optics into a sleek, casual style for your everyday needs, especially if everyday consists of getting out, working out, and playing in the mountains. N3 polarized Reflex lenses block up to four times the amount of infrared light than regular polarized lenses, and they enhance contrast, block glare, and provide superior impact resistance. An interchangeable lens system allows you to replace the Hardtop Ultra's lenses with others in seconds. Native Eyewear paired these stunning optics with an equally stunning frame made of Rhyno-Tuff Air's collision-resistant thermoplastic. The frame also features cushy co-injected molding, Mastoid's grip at the temples, and Cushinol's soft pads at the adjustable nose. 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.