Abstract: A musical instrument case cover is disclosed, the cover being comprised of flexible fabric top and bottom panels having a surrounding side panel of the same fabric therebetween. The side panel is longitudinally bisected over a portion of its length by a slide fastener. The fabric employed in the panels is comprised of a reflective outer portion made up of an outer clear polyester coating over a reflective metallic layer of aluminum. A sheet of woven strips of polyethylene backs the metallic layer which, in turn, is backed by a layer of resilient foam. A fabric lining is the innermost layer, the top and bottom panels having a thick layer of resilient foam between this lining and the reflective outer portion. Interior slide fasteners secure openings in the fabric lining through which the thick layer of foam may be removed and replaced.