Believe it or not, memory foam came about in the early 1970's when NASA funded a development project intended to make a substance that could help reduce the discomfort astronauts experienced during lift-off. During the course of research, a new foam substance, called visco elastic, was created that was capable of conforming to a person's shape and then revert to its own natural state when pressure was taken away. The foam allowed for the uniform distribution of body weight over the whole surface of the foam, swiftly adapting to any movements of the body. Tempur-Pedic introduced the first memory foam beds in 1992, to great success.

A visco memory foam mattress isn't what you would call a "soft" mattress. It molds and contours to your body, and the contouring effect distributes that weight over more of the sleeping area, thus eliminating pressure points. On an average spring mattress, pressure points can create soreness and cause you to toss and turn, so visco's contouring characteristics will allow for a better night's rest.

An additional feature of this foam is the open cell composition, which allows the bed to breathe. Essentially, the memory foam beds won't retain your body heat and moisture, leaving the sleeping surface comfortable the whole night.

Visco foam is also very highly resistant to odor causing germs, mold and bacteria. Since many people suffer with allergies, visco can help to improve your overall health and comfort by reducing the presence of these allergens in the bedroom.

A memory foam bed also works to lessen motion transfer between you and your spouse, so if one of you moves at some point in the night, it won't rouse and disturb the other. Fewer disturbances from movement means a deeper, more restful sleep.

It's important to know that good memory foam beds will not require a box-spring below them for extra support. Though you can certainly order a platform base to raise the height of the mattress, it has worth noting that the mattress should feel just as good laying on a flat, concrete surface.

Additionally, sure to take a good look at the warranties that different companies offer and beware of poor quality imitations. You cannot be certain of the quality of memory foam from overseas, so be wary of foam mattresses that are not manufactured in the US.

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