What is memory foam? Visco-elastic memory foam was originally developed by NASA and used on space shuttles to relieve pressure on astronauts caused by G-Forces during take off. It is several times denser than regular polyurethane foams. Memory foam is temperature sensitive and recovers to its original shape. Memory foam has the distinctive property of relieving pressure and has been developed into many products such as pillows, beds, pads, etc., benefiting millions of users worldwide.