The Naturepedic Organic Cotton Ultra 252 Seamless features premium support, waterproof seams, and a stronger more luxurious organic cotton cover for an outstanding sleep environment. With 252 coils, edge support, organic cotton throughout, and a firm easy-to-clean non-toxic waterproof surface, the Organic Cotton Ultra 252 is an excellent choice for parents seeking to eliminate potentially harmful chemicals and allergens. Naturepedic is a GOTS certified organic mattress manufacturer and has earned the trust of moms and doctors across the country. Naturepedic also meets the strictest GREENGUARD® certification standards for eliminating chemical emissions. Winner of numerous awards and prestigious endorsements, Naturepedic organic crib mattresses are simply the healthiest available.