Foam mattress can be a type of mattress that's made from polyurethane. Besides memory, it is also created from other types of substances. The compounds that are put into the mattress foams allows the ability to increase in occurrence to it. Memory foam mattress can also be called visco elastic memory foam. The mattress was developed as a way to meet with the mattress shoppers' desire. The annals of the Foam Mattress can be traced back to NASA's Ames Research Center. NASA's Ames Research Center borrowed a project to design a mattress foam that can help to relieve pain of the astronauts due to g-forces back in the 1970s. NASA thought the foam material should be used to comply with the form of the human body. Anyone could ultimately move out of the career although making a form for that body can help to fix the issue. Because of this, incorrect stress points will be formed on the body. Later, a way to create a foam that could evolve the the body's condition was identified by the investigation team from the Ames Research Center of NASA. It's a elastc foam that may equally distribute the human body's weight for the foam surface. In 1991, an organization based in Sweden, Tempur Pedic sold the study mattresss foam towards the people in Sweden. Next, Tempurpedic offered the memory mattress foam to the people that live-in Canada and United States. Tempurpedic's mattress became extremely popular. The achievement of Tempurpedic had caused the manufacturers to create their own types of foam beds and promote them towards the local consumers. Polyurethane foam product can be used while the foam memory. The bed manufacurers can incorporate several kinds of substances to change the density of the foam. The foam can have greater density following the substance is included. Besides, a visco elastic foam product will be added by the manufacturer. The visco elastic foam is nontoxic. Just how much substances are used in the manufacturing means of the foam detemins the foam fat. Most polyurethane foam mattress has a fat of 4 - 5lb. Brighter foam mattress weight inbetween 2 - 3 lb.