The Serta 4" Pillow-Top and Memory Foam Mattress Topper turns your mattress into a luxurious sleeping surface with a soft pillow-top and cradling memory foam. The 3-inch layer of memory foam gently supports you while alleviating painful pressure points that can cause tossing and turning. The memory foam layer is topped with one inch of plush pillow-top adding comfort. The included quilted cover secures and protects the topper, is removable, machine washable and stretches to fit up to a 17-inch mattress. This Serta mattress topper is the perfect way to upgrade a new mattress or extend the life of an old one.