"Magnifying life does, indeed, include sea life. And these are just the binoculars to do it. Our legendary 7x50mm Marine binoculars are a premier choice for spotting marinas, deadheads or the fisherman's best friend, feeding birds. Built to withstand rugged nautical conditions, they are nitrogen-purged to provide reliable waterproof/fogproof performance. The 13-7501 model is even hermetically sealed to further assure that no moisture creeps in. Impressive light transmission from BaK-4 porro prisms, multi-coated optics and large UV-coated objective lenses brighten images from dusk to dawn. And, all three models not only float, but easy-grip rubber armoring protects and provides a secure hold should things get rough. Always nice, should an unexpected swell or throttle burst take you by surprise|BaK-4 porro prisms for bright, clear, crisp viewing.|Multi-coated optics for superior light transmission and brightness.|Rugged, 100% waterproof construction.|O-ring sealed and nitrogen-purged to keep out moisture.|Highly resistant to saltwater corrosion.|Individual eye focus.|Non-slip, non-skid rubber armor cushions bumps and shock, prevents sliding, and provides a firm grip when wet."