Memory Foam is a high density polyurethane foam sensitive to heat and pressure. It is an ideal material for memory foam firm mattress construction with its delayed resiliency. This allows Memory Foam to conform to the shape of your body making for a very comfortable sleep surface. The foam is available in different levels of firmness for body support. A firm memory foam mattress surface feels less soft to the touch than either a plush or pillow-top mattress. A firm mattress with memory foam gives the support you need with a feel that is stout.