Brunton makes the Eterna 8 x 45 and 11 x 45 Full-Size Binocular with a waterproof composite case to add durability and decrease weight. The BaK-4 prism glass increases sharpness, so you get a crystal-clear picture when you need it the most. Built to meet the demands of serious backcountry use, the Brunton Eterna Binocular includes a durable phase coating on the lenses to reduce any chances of scratches. Whether you"re scoping an alpine route or tracking an elusive bird, this versatile, durable, high-powered binocular is up to the task.