Memory foam is a viscoelastic material and, as a result, softens with the application of pressure. Once the source of the pressure is removed, memory foam slowly returns to its original shape. This special quality of memory foam allows it to reduce the stress on joints by more evenly distributing the bodies' weight. This special quality also allows memory foam to be used in the manufacture of a variety of products including mattresses, seat cushions, and pillows. In addition, memory foam is body-warmth reactive. At body temperature, memory foam becomes soft and pliable and so further molds to the shape of the body. In addition to the above qualities, memory foam reduces movement-related disturbances when used in mattresses. This is because memory foam absorbs movement and reduces its transmission to other parts of the mattress. The above qualities of memory foam make it highly desirable in various mattresses and pillows used in bedding and other furniture. In short, memory foam is used to fulfill the need of the user to have a comfortable and restful sleep.