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. Measures 27.75" x 52" x 6" with square corners for a snug fit. Heirloom quality with a lifetime limited warranty. Made in the USA.