using top-end optical performance with Nikon ATB ruggedness and full-sized view, this binocular can tackle the most extreme conditions. Waterproof and fogproof. Roof prism design. Bright, multicoated Optics, turn and slide rubber eyecups, rubber armored body, long eye relief- great for eyeglass wearers, internal focus system. Features Lead and Arsenic Free ECO GLASS.