An excellent on-the-water viewing companion, the H20 10x25mm binoculars feature a soft texture grip to keep them on board and in your hands in the most challenging conditions. They provide BaK-4 prisms and multi-coated optics for superior light transmission and bright, clear viewing. Constructed to be 100 percent waterproof, they are O-ring sealed and nitrogen purged for fog-free performance. Provide twist-up eyecups, larger center-focus knob, and longer eye relief..