The Viscoelastic foam in Nikken Intelli-Rest pads and pillow is a unique material. It has a special open-cell construction that has the ability to conform to any shape. The "memory foam" was originally used in aeronautical and space applications. It was developed at the Ames Research Center in conjunction with the United States space organization NASA. The Nikken Intelli-Rest KenkoPad is the only sleep system that combines this material with Advanced Magnetic Technology and Rubberthane. Some other products may use viscoelastic foam, but only Nikken offers all these technologies in one design, to provide an unparalleled sleep environment.