The Naturpedic Organic Cotton No-Compromise Waterproof Flat Portacrib Pad is soft and breathable providing a non-sweaty and comfortable waterproof barrier that blocks dust-mites and other allergens. The top and bottom layers are 100% cotton fabric. The ultra-thin waterproof membrane 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 less sweaty backs and a drier more comfortable sleep. It provides an excellent alternative to vinyl and latex rubber. This alternative design has NO Vinyl - PVC NO Phthalates NO Latex (for allergy concerns) and is machine washable.