The Pentax AD 9x28 Compact Waterproof binoculars are designed for the outdoor adventurer in mind. Delivering bright, clear images through BaK-4 prisms and fully multi-coated lenses to maximize light transmission, enhanced image contrast and color rendition. The asymmetrical hinge design enables to binocular to fold up into a compact design which cuts weight and allows for more portability. The body is made of corrosion and impact-resistant fiberglass with reinforced polycarbonate polymer and temperature resistance for nearly any climate. The optics are fogproof and waterproof for the avid outdoor adventurer.