The Naturepedic Waterproof Organic Cotton Portacrib Pad features a waterproof, soft and breathable surface that provides a soft, non sweaty and comfortable waterproof barrier and also blocks dust mites and other potential allergens. The top and bottom layers are made with 100% organic cotton fabric with an ultra thin waterproof barrier in the center, which effectively blocks liquids from passing through while still allowing the fabric to "breathe." Some water vapor is allowed to escape resulting in less "sweaty backs" and providing a drier, more comfortable sleep. Machine Wash and Dry. Portacrib Pad Size 24" x 38".