Memory Foam is one of the biggest breakthroughs in the field of sleeping science.What most people do not know is that the Memory Foam is actually invented by NASA and used on space shuttles to relieve pressure on astronauts caused by G-Forces during take off. It is the only foam that has the ability to contour with the body of the person using it. Additives are added to polyurethane foam to increase viscosity and density. Thus, it has the ability to give more comfort to its users. Memory Foam is several times denser than regular polyurethane foams.It is also the only foam that has the ability to go back into its original form even after you have slept on it all night. Additionally, it is able to adjust with your body temperature. Plus it also has pressure relieving properties.Visco-Elastic Polyurethane FoamDimensions: 19"x12"x5"