To give a piece of foam memory, you start with a synthetic polyurethane foam material and add certain types of chemicals which add an increase in weight or density to the foam. With the addition of these chemicals, a non-toxic, foam material is created. However, there are many features along the way that will help determine what type of memory foam you end up with. To understand exactly what differences are found in each final product, you first have to start with understanding how to grade each foam.
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