FACT: The average American will spend one third of their life in bed! This organic cotton waterproof mattress topper by Naturepedic will keep you and your family breathing healthy all night long. Made with two layers of jersey organic cotton fabric for maximum comfort and flexibility on top and bottom with an ultra-thin waterproof barrier in the center. Features DrySleep™ technology, which effectively blocks liquids from passing through to the mattress below. Some water vapor is allowed to escape, which helps provide a more comfortable sleep. Also blocks dust-mites from penetrating the mattress sleeping surface. Versatile design handles mattress depths from 9" to 16" with organic cotton skirt and full elastic perimeter.