Bushnell H2O 10x42 Waterproof/Fogproof Binocular w/Roof Prism Waterproof, fogproof binoculars designed for use on or in the water O-ring-sealed and nitrogen-purged to complete lock out moisture Rubber armoring with textured pads; large center focus knob 10x magnification and 42mm objective diameter; 12-foot close focus distance Twist-up eyecups and long 17mm eye relief; limited lifetime warranty