Bushnell Marine binoculars are designed for sea use and for extraordinary conditions at sea. They are not only waterproof but are also designed to float on water which means that the fear of losing your Bushnell Marine binoculars at sea is minimal. They are not only waterproof, but also nitrogen filled to prevent fog build up at low temperatures. The exterior of Bushnell Marine binoculars is rubber coated to ensure good grip even when wet. All lens surfaces are multi coated which enables excellent image sharpness and contrast from one end to the other. All housing parts are rust protected and the rubber exterior prevents damage to the housing from light knocks. Bushnell Marine binoculars are a sure bet for every marine expedition.