Memory foam consists mainly of polyurethane as well as additional chemicals increasing its viscosity and density. It is often referred to as "viscoelastic" polyurethane foam, or low-resilience polyurethane foam (LRPu). The foam bubbles or ‘cells’ are open, effectively creating a matrix through which air can move.Higher-density memory foam softens in reaction to body heat, allowing it to moldto a warm body in a few minutes. Newer foams may recover more quickly to their original shapeSpecifications:-•50 Density•60 Density