The Bushnell 10x42 H2O Waterproof Porro Prism Binoculars are great for all-weather purposes, with a fog proof housing and easy-grip rubber armouring textured with soft ridges. These Busnell Binoculars feature non-slip rubber armoring, twist-up eyecups and an easy to use center-focus knob. The Porro prism design of these Binoculars allow for a greater depth of field than similar roof prism designs. These weather-sealed Binoculars from Bushnell provide bright and clear images, with a great level of details, thanks to the Bak-4 prism glass and multi-coated lens system.