Memory foam mattress is made up of polyurethane. Apart from polyurethane , it is also made from various other types of chemicals. The materials which are used for its preparation are mostly used for increasing their density. It is also known as visco elastic polyurethane foam. These mattresses are designed with a aim to meet the desire of shoppers.

Memory foam has its roots of origin from the NASA’s Ames research center. Their main aim was to develop a mattress foam which can be used for providing relieve to their astronauts from the back pain caused by the pressure of g-forces in the decade of 1970′s.
NASA believed that this foam material would be used for conforming body shape. Though a mold for the body will help a lot in relieving from pain problem, the siting person would suddenly move out of the position. As a result of which, incorrect pressure points will be emerged on the body. Further, NASA got success in developing a visco elastic foam which can evenly distribute the body weight on to the surface of foam.

Now synthetic polyurethane foam material is used for the preparation of foam memory. Then mattress manufacturers will add various other chemicals for adjusting with the density of the foam. Now in the market one alternate is available for memory foam mattress, it is known as memory foam mattress toppers. There are various key facts relating to these kinds of coverings: 1- After doing various researches it has been proved that almost ninety percent of the memory foam users have their more support to the
memory toppers; reason being it provides more support to the person who is taking sleep over it. In comparison foam mattress, memory foam mattress topper is available with reduced price. Its cost vary between 50 to 190 dollars.