Naturepedic features Air-Core™, a non-toxic environmentally friendly support layer made from 100% food-grade polyethylene. Air-Core is a network of closed cell air pockets that provide a firm and comfortable base without the toxic properties of polyurethane foam and the allergenic concerns of latex rubber. The mattresses waterproof organic cotton cover features a clear 100% polyethylene food-grade waterproof coating that is non-allergenic and easy-to-clean. Naturepedic’s exclusive fire protection system features a non-toxic and naturally derived fire barrier system that is safe and effective. It meets and exceeds all Federal and State flammability standards without the use of potentially harmful chemicals. Naturepedic – because your baby’s health and safety should not be negotiable.