This 4¾" thick mattress has individually wrapped pocket springs enclosed in a generous layer of pressure-relieving foam. Since the springs work independently, they closely follow your baby’s body and provide support in the right places. The well-ventilated construction provides your baby with a pleasant sleeping environment. A practical handle makes the mattress easy to carry ‒ and to turn over when making the bed. You can remove the outer cover and machine wash it at 140°F (Hot).