Safety 1st Cozy Snuggles Ultra Firm Baby Crib Mattress will give your baby the comfort they truly deserve. This one of a kind mattress is made with a thermo-bonded core made from polyester fibers, that offers optimal support all night long. The removable outer cover is made from polyester and rayon on Bamboo which makes it both water resistant and easy to clean. In addition, its lightweight construction is both durable and comfortable, suitable for all standard baby cribs with internal measurements of 285/8 in. X 53 in. Assembled in Canada without the use of flame retardant chemicals and comes with a 10-year limited warranty, guaranteeing your little one restful sleeps for the years to come.