We engineered our Roof-Prism Binoculars to deliver excellent performance at affordable prices. Their interiors are nitrogen-charged and O-ring sealed to make them 100% waterproof and fogproof. All have BaK-4 roof prisms and quality lenses to produce clear, crisp images and colors. Optics are contained in an attractive, rugged rubber armor that protects from weather and impact during active use in a wide range of conditions. Their light weight and ease of operation will be appreciated during long excursions. Each model has long eye relief and twist-up eyecups, making them convenient to use for everyone, even those who wear glasses. A large, centrally located, grooved focus wheel is engineered to bring images into view clearly and quickly with one hand. Imported. Sports and Outdoors > Sport... Less