Fits EOTech XPS models only. The Lens Covers For The XPS 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 cover will fold back so that it is not damaged. Because of the contours of the EOTech housing, these covers are not 100% waterproof, but they do prevent most dust, debris, rain and snow from accumulating on the lenses. These unique lens covers can be easily operated with either hand to provide flexibility of operation. The design and methodology is so unique that we were awarded a patent. If you like to have a little fun with you tactical accessories, we are now offering the front lens cover engraved with "FRONT TOWARD ENEMY" at no additional charge.