Basically, the more density, the better support you get. The reason many manufacturers make mattresses with less density is purely economic; they contain less material and more air, thus reducing manufacturing costs. Whichever brand you buy, be sure to buy a memory foam mattress that has at least a 5 lb/cubic foot density.
I've heard memory foam mattresses are hot. Is this true?
The cells are open and breathable so the mattress is self ventilating. However, because there is more body contact with the mattress there is less ventilation between sleeper and mattress
Source link: http://www.americanchronicle.com/articles/viewArticle.asp?articleID=42390
Almost overnight consumers began replacing their old mattresses for this new viscoelastic material now simply known as memory foam. However, memory foam isn�t the foam that has been used for many years in conventional mattresses. The following describes why the Tempur-Pedic mattress � and all other memory foam mattresses � are so different and sets a memory foam mattress apart from all other types.
The story has it that NASA first developed this new foam to help absorb the G-forces that their astronauts experienced during the flight � whether this story is true is debatable. What is true is that a Swedish company was the first to perfect the manufacturing process of memory foam. Tempur-Pedic is now the company with the TEMPUR license and is based in Lexington, KY.
The Tempur-Pedic memory foam mattress differs from conventional inner-spring mattresses because there are no springs. Memory foam also differs from latex and foam because the bubbles found in latex and foam are closed, i.e
Source link: http://www.americanchronicle.com/articles/viewArticle.asp?articleID=41716
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