The Nautica N4021 Black w/Navy Blue are a stylish pair of glasses online that feature narrow stylized rectangular shaped lenses rimmed in a lightweight yet durable super dark navy (almost black) frame. What makes these frames so special are the polarized clip on lenses that come with the frame. Magnets allow the clip on to be removed and replaced easily and with no fuss. They're perfect for those who frequently run in- and outdoors. For added comfort and style, these tough frames have adjustable nosepads, reinforced temple pieces - and even spring-hinges for added convenience!