The Naturepedic Organic Cotton Portacrib Mattress features a luxurious 100% organic cotton fabric with an easy-to-clean 100% polyethylene clear food-grade waterproof coating that provides a non-toxic hypoallergenic dust mite barrier and stain resistant surface. Organic cotton filling is unbleached, undyed, and grown without synthetic pesticides, herbicides, or chemical fertilizers. Firm Support features Air-Core(tm), a non-toxic 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 chemicals in polyurethane foam and the allergenic concerns of latex rubber. Non-toxic fire protection system meets and exceeds all Federal and State flammability standards without the use of potentially harmful chemicals. Portacrib Mattress Size � 24" x 38" x 1.5".