The Bushnell 12x25 H2O Binocular has a design, which is 100% waterproof and fog proof. The view of this binocular is also very clear and bright, due to the Bak-4 prism, which are the best type of prisms used in binoculars. In addition to the Bak-4 prism, the optics of the Bushnell 12 x 25 H2O are also multi-coated which guarantee for sharp view. As the name of H2O binoculars reveals, they are specifically designed for use in harsh weather conditions, like heavy rain or fog, for this purpose they are O-ring sealed plus Nitrogen purged. The Bushnell 12x25 H2O is also rubber armoured providing a strong grip which is necessary for binoculars made for harsh weather conditions. This H2O Folding Binocular is perfect for skiers, snow-mobilers, anglers and kayakers.