GiGi Butterfly Memory Foam Head Pillow Black High Technology:GiGi Space Memory Foam is a high-tech material originally developed by NASA for space programs with the original purpose of providing protective and comfortable cushion for astronauts during the space travel. It absorbs heavy weight as well as light weight. Pressure Relieving:GiGi Space Memory Foam has an unmatched durability because its high-density material guarantees strong durability and powerful support. Such kind of pressure relieving property avoids the pain and discomfort caused by rebound pressure or weight self-building. Blood Circulation Improvement:Softened or hardened according to the change of human temperature, GiGi Space Memory Foam shapes your body and eliminates the pressure point. The blood in your body can not be pressed but circulates freely. Hundreds of millions of viscoelastic temperature sense memory particles constantly move and follow your body shape.