An ideal companion for general-purpose glassing on the trail, at the stadium, or around town, the Nikon 10x25 ProStaff ATB Binocular is equipped with space-saving BAK4 reverse-Porro prisms, a multi-coated optical path, and aspherical eyepiece lenses. These features work together to produce clear and crisp high-contrast views with accurate color rendition. Nikon's proprietary Eco-Glass optics are made of environmentally-friendly lenses and prisms that don't contain lead or arsenic. Complementing the image quality, the optical tubes are nitrogen-filled and O-ring sealed to be waterproof and resistant to internal fogging; and the housing is wrapped in a textured rubber armor that provides a slip-resistant grip — especially in cold or wet weather. Weighing less than 13 ounces and measuring a mere 4.5-inches long, the ProStaff ATB can easily fit in most packs, pockets, or purses without adding excessive bulk to slow you down.