Pentax DCF NV Nitrogen-filled waterproof construction (JIS Class 6) allow these binoculars to be used in the most extreme weather conditions and be submerged to 1 meter High-resolution phase-coated and super-reflective coated roof prisms provide high resolution, high contrast images Fully multi-coated lenses increase light transmission and color quality Fiber reinforced polycarbonate design make these binoculars extremely lightweight and durable Rubber covered exterior provides a sure grip and protects the internal mechanisms