Sleep easy knowing your baby is safe and comfortable with Safety 1st Precious Angel Supreme Firm Baby Crib Mattress. Its firm support is all thanks to its high-density thermo-bonded core. What's more, its outer removable cover is made from polyester and rayon of Bamboo that not only is water resistant and washable, but also provides with top comfort. The Precious Angel Supreme is made to fit any standard baby crib with internal measurements of 285/8 in. X 53 in. This Safety 1st mattress is made without the use of flame retardant chemicals, it is assembled in Canada, and comes with a 15-year limited warranty.