“A polyurethane material that is sensitive to pressure and temperature, used especially in mattresses, where it moulds to the shape of an individual's body because memory foams have an open-cell structure that reacts to body heat and weight by 'molding' to the sleeper's body, helping relieve pressure points, preventing pressure soures, etc. Most memory foam has the same basic chemical composition so it’s cold when you touch it, however the density and layer thickness of the foam makes different mattresses feel very different. A high-density mattress will have better compression ratings over the life of the bedding. A lower-density one will have slightly shorter life due to the compression that takes place after repeated use. This type of foam generally used in superior quality mattresses, sofa, furniture, rolling chair & industry use etc”