The Naturepedic Organic Cotton Classic Baby Crib Mattress features organic cotton fabric and filling as part of a healthier, non-toxic design plus a patented food-grade waterproof surface made from non-GMO sugarcane that easily wipes clean. Your baby will be sleeping on a firm, healthy, certified organic mattress that's fully waterproof for a truly hygienic sleep environment. No flame retardants whatsoever or other questionable materials.