Naturepedic 2-in-1 Organic Cotton Ultra Quilted Matress - Twin Trundle - 38" x 75" x 6" Luxrious organic cotton fabric with easy-to-clean 100% polyethylene waterproof surface Provides the ultimate non-toxic and stain resistant waterproof mattress cover. Also functions as a dust mite/bed bug barrier - no need for an additional dust mite encasing. Extra strong for long lasting durability with natural color finish.