The H2O 10x25 Compact Foldable Binocular (Blue) from Bushnell is made for the mariner. O-ring sealing ensures waterproof operation in the kayak, ketch or yawl. Nitrogen purging prevents fogging and moisture build-up in an early morning fog, an afternoon rain squall or a twilight tempest. The blue rubber armoring has a soft, textured grip to keep them on board and in your hands. Multi-coated optics with BAK4 prisms deliver up superior light transmission with bright, clear, crisp viewing. A dioptric adjustment ring and twist-up eyecups provide customized eye focusing with or without eye or sunglasses. Boating, fishing or hiking upstream, this is a practical compact roof binocular that will always be within immediate reach.