Abstract: It is disclosed a foldable surface of a first flat expanse. The surface includes four identical pockets for receiving four flat rigid inserts, and borders between the pockets. The borders allow folding of the surface a much smaller second flat expanse. A shape of the flat rigid insert may be a rectangle, a square, half a circle, a quarter of a circle, or an equilateral right-angle triangle. The foldable surface includes textile, fire-retardant treated textile or a textile withstanding a temperature of 1000° F. The filled pockets are covered with sheaths. Margins of the pockets and margins of the sheaths include mating straps. The foldable surface further includes a skirt disposed downward from the perimeter of the first flat expanse. The skirt may have height of at least 5 inches, and may include holes for its anchoring to underneath objects.