The Sealy Baby Ultra Rest Crib Mattress offers firm support plus comfort layers for infants and toddlers. The 204 innerspring steel core provides long-lasting firmness and durability and anti-sagging vertical support bars help evenly distribute baby’s weight across the entire surface of the mattress. Hypoallergenic cushioning layers help keep baby comfortable, while the durable, waterproof cover easily wipes clean. Sealy is the #1 brand of crib mattress in America. With dependable durability and comfort, it’s no wonder more babies sleep on a Sealy than any other crib mattress brand. This entire mattress is GREENGUARD® Gold Certified for indoor air quality and low chemical emissions to help create a healthier sleeping environment for your baby.