The Naturepedic Organic Cotton Cradle 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. Cradle Mattress Size – 18" x 36" x 1.5".