The Vortex Razor HD 12x50 Binocular is ideal for extreme terrain and the harshest conditions. These binoculars feature an APO system, HD lens elements, XRPlus fully multi-coated, dielectric prism coatings, plasma tech, phase correction, roof prism, true open hinge, magnesium chassis, waterproof/fogproof exterior, AmorTek, rubber armor, multi-position eyecups, center focus wheel, locking diopter, and tripod adaptability.