Waterproof, Soft and BreathableProvides a soft, non-sweaty and comfortable waterproof barrier (as compared to vinyl and rubber). Also blocks dust-mites and other allergens. 100% Organic Cotton Fabric - Top and Bottom Layers Ultra-Thin Waterproof Membrane In CenterFeatures 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 less sweaty backs and a drier, more comfortable sleep. It provides an excellent alternative to vinyl and latex rubber.Alternative Design NO Vinyl / PVC NO Phthalates NO Latex (for allergy concerns)Machine Wash DrySize:Full w/Straps - 53inches x 75inches