Foam mattress is a type of bed that is created from memory. Besides polyurethane, it is also produced from other types of compounds. The compounds that are put into the bed foams provides it the ability to increase in thickness. Memory foam mattress can be called visco elastic memory foam. The bed was developed to be able to meet the mattress shoppers' need. The Memory Foam Mattress' annals can be traced back to NASA's Ames Research Center. The Ames Research Center of NASA borrowed a task to style a bed foam which will help to alleviate pain of the astronauts due to g-forces back in the 1970s. NASA believed that the foam product must be used to adapt to the human body's design. Anyone might ultimately move-out of the position although creating a shape for the body will help fix the problem. Because of this, improper pressure points is going to be created around the body. Later, the investigation staff from NASA's Ames Research Center identified a way to create a foam that may conform the the body's design. It's a visco foam that will evenly distribute the weight of the body to the foam floor. www.amerisleep.ca/as2.html The finding induced Fagerdala World Foams of Sweden promote the customers it and to experiment with it. In 1991, a business situated in Sweden, Tempurpedic sold the people the study mattresss foam in Sweden. Next, Tempur Pedic bought the memory mattress foam for the people that live-in Usa and Canada. The mattress of Tempurpedic became very popular. Tempur Pedic's success had caused the makers provide them to the local consumers and to make their own variations of memory foam mattresses. Polyurethane foam product is employed since the foam memory. The bed manufacurers may add various kinds compounds to alter the thickness of the foam. The foam will have greater density, after the chemical is included. Besides, a visco elastic foam product will be added by the manufacturer. The visco elastic foam is non-toxic. The foam fat is detemined by just how much chemicals are used inside the production process of the foam. Brighter memory foam mattress weight in between 2 - 3 lb.