Built to withstand extreme nautical environments. And float in them. We suggest you keep them on board, but made our Marine series binoculars buoyant, waterproof and corrosion resistant, so a little dunking would not deep-six your day. You will appreciate the ultra-bright, crisp views granted by their multi-coated optics and premium BaK-4 prism glass. Rugged rubber armoring provides a sure grip, absorbs shock and keeps them from sliding in rough conditions. They are essential equipment if you spend much time on deck, and are not fazed by a little time off it.