The Marker Projector Clarity Mirror adult winter sports goggles offer a large field of view as well as a design that looks as good as it performs. Those alpine ski or snowboard goggles feature a high quality spherical lens with NMT Optics coating. NMT OPTICS (Nictitating Membrane Technology) technology is an extremely robust surface that provides great visibility. This membrane prevents water, grease or dust from sticking, and moisture wicks away quickly. Fingerprints, dust and sweat have no surface to cling to and thus are easy to remove.