The 6-inch Memory Foam Mattress by Delta Children features multiple layers of foam that help your child to sleep better and longer. This mattress has a 2-inch layer of comfort memory foam on top a 4-inch supportive base made from high-quality foam. The comfort memory foam on the top conforms to your child's body and offers pressure point relief that helps kids and young adults get the rest that is essential to their overall health and development. A water and stain resistant knit cover helps to keep the mattress clean and blemish free for years to come. To make life even simpler, this mattress is shipped to your doorstep in a small, easy-to-ship box. It's compressed, rolled and vacuum-sealed for your convenience. Allow 24 hours for the mattress to fully expand.