View distant images with great clarity with the National Geographic waterproof roof binocular. It is designed with a 42mm aperture that allows more light to pass through the lenses to give you bright images. The roof prism design makes it comfortable to hold the binocular, while the waterproof and fogproof construction make it ideal for use in different weather conditions. | National Geographic 42mm 10x Waterproof Roof Binoculars (80-76510)