Alpen's high performance Shasta Ridge binoculars are fully waterproof, fully multicoated, have long eye relief, and feature BAK4 optics that allow hunters, shooters, birders, boaters, and outdoor enthusiasts clearer, brighter viewing under all conditions. And, they feature Alpen's lifetime warranty. The full size models have a sleek roof prism design while the compact models are porro prism design. Both designs provide the performance required by the most dedicated sports optics users. Shasta Ridge binoculars meet the extreme all weather needs of today's active adventurers. When your goal is top performance and great value, the Alpen Shasta Ridge is your best choice.