A king size memory foam mattress would solve your back pain problem. Memory foam is one of the most innovative mattress materials to be developed in the last decade. What is called memory foam today was first discovered by NASA when they were looking for a material to protect astronauts from the pressure of lift off. They needed a material that would contour perfectly to the shape of each astronaut's body, but would shift with the body. In other words they needed an all new material.