The GG&G EOTech Lens Covers fit between the EOTech hood and the body of the EOTech housing. They are spring operated so that once pressure is applied to release them from the closed position they spring open. The rear cover lays across the top so as not to interfere with the field of view. The front cover opens and serves as a sun shield. However if heavy brush etc. is encountered the front lens will fold back so that it is not damaged. Because of the contours of the EOTech housing these rifle scope lens covers are not 100% waterproof but they do prevent most dust, debris, rain and snow from accumulating on the lenses. Features: Installs easily with provided tool No alteration to the optic Protects optic's lenses Ambidextrous activation tabs on front and rear cover