Made with two layers of stretch knit 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 while still allowing the fabric to "breathe." Some water vapor is allowed to escape resulting in more comfortable sleep. Also blocks dust-mites and other allergens. Fitted design with organic cotton skirt and full elastic perimeter. Available in Twin, Twin XL, Full, and Queen sizes and Standard or Deep Pocket size.