Best Use for Bird Watching , Sight Seeing , Game Watching , For Wild View , For Mountainer ,Tower Viewing and and for General Purpose. Dielectric high-reflective multilayer prism coating ensures superior transmittance uniformity across the visible range, resulting in brighter images and more natural colours. All lenses and prisms are multilayer-coated for brighter images. Waterproof and fog-free with nitrogen gas. Rubber armouring for shock resistance and a firm, comfortable grip. Lightweight body uses fibreglass-reinforced polycarbonate resin.