The American Baby Organization Waterproof Fitted Quilted Porta-Crib Mattress is usually a waterproof, flat, porta-crib size quilted mattress pad that features a top rated layer constructed of 100 percent cotton quilting. The middle layer from the pad is constructed of a poly fiber filler. The bottom layer is constructed of waterproof vinyl that is definitely intended to not rustle when moved on to get a quiet surface. My websites: best crib mattress review