Bushnell builds optics with foresight. The H20 series binoculars are O-ring sealed and nitrogen purged to completely lock out moisture should you spill, take one overboard, or simply run into foul weather along the way. Rubber armoring with textured pads gives you a grip in slippery situations. Multi-coated optics and premium quality BaK-4 prism glass maximize light transmission and image clarity. You'll quickly see how a dependable set of binoculars can magnify your adventures on and around the water. Features fold-down or twist-up eyecups, large center focus knob for easy, precise adjustments, and longer eye relief. 346' FOV at 1,000 yds.