Tasco Sierra Roof Prism 10x 42mm Binocular (Clamshell Packaging) is an ideal choice for outdoor activities such as bird watching, hunting, hiking and more. This Sierra roof prism delivers impressive image brightness and increased contrast to produce detailed images, thanks to the Tasco's multi-coated lenses. The binocular is rubber armored to withstand the harshest of habitats. Its fogproof, waterproof and shockproof construction allows the binocular to be at home in all weather conditions. Its smooth center focusing knob allows rapid target focus, even while wearing gloves in cold temperatures.