Close the gap so things can't fall between Place at headboard, footboard or between side-by-side mattresses Storage pocket keeps necessities within easy reach Machine washable cover stays cool in the summer and insulates in cold weather Pillow is crafted of 80% polyurethane foam, 20% polyester/cotton fabric If you're tired of straining to reach things that fall between your headboard and mattress, this mattress gap filler is the solution. Place the wedge at the headboard, footboard or between side-by-side mattresses. It closes the gap between the mattress and bed frame, so things can't fall between. Keeps pillows perfectly propped. Storage pocket puts necessities within easy reach. The soft, breathable cover stays cool in the summer and insulates in cold weather. Machine washable cover. Pillow is crafted of 80% polyurethane foam, 20% polyester/cotton fabric. Comes in lengths to fit Twin (6" long x 39" wide x 6" high), Queen (6" long x 60" wide x 6" high) and King (6" long x 76" wide x 6" high) size beds.