This 4 layer mattress pad includes: a high quality 200 thread count cotton top; an absorbent, padded layer; a waterproof barrier; and finally, a polyester bottom layer with a full elasticized skirt. The cotton top mattress pad protects against bacteria, which can degrade fabric and lead to odors and stains. Your bed stays fresh and clean. With a fully waterproof top, you can protect your mattress from bedwetting accidents and never have to worry about spills and stains seeping through the mattress. Machine wash/dry.