Initially designed for NASA. This foam has a molecular structure which makes it pressure sensitive to allow parts of the body that exert a lot of pressure sink into the foam further than the rest of the body. It is heat sensitive, thus body heat further allows depression of certain pressure points. This posture support created during sleep will allow tension free alignment of the spine. The Polyurethane (PU) foundation layer provides the support required to maintain the corrective position and not allow the memory foam to have the opposite effect (by inverting the posture and spine).