BARSKA Deep Sea 7x50 Waterproof Binocular O-ring sealed for complete waterproof protection and Dry nitrogen-purged and sealed to prevent fogging and moisture damage in all weather conditions Fully multi-coated optics delivers luminous and high contrast images with BAK-4 prisms for increased clarity Extremely crisp and clear with green colored lens enhancing clarity Heavy duty and shockproof rubber armor Features a rugged rubber armor covering that provides a non-slip and secure grip, designed specially for nautical use