Our 4-ply Quilted Waterproof Mattress pads are softer and quieter than ever before. While providing waterproof protection, these pads are comfortable with a deep stretch polyester knit skirt. As 4-ply construction, these pads are composed of a T-180 poly/cotton top, 4.5 oz. bonded polyester fill, a polyurethane waterproof barrier, and a stretch knit polyester back. These mattress pads are machine washable.