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subject: An Explanation of the Memory Foam Mattress [print this page]

An Explanation of the Memory Foam Mattress

Usually a mattress made of memory foam is denser than any other type of mattresses that are made of foam. This memory foam

mattress is heavier but more supportive. It is frequently considered a great compromise between the solidness of firm

mattress and the comfort of a soft one. Frequently a memory foam mattresses will out sell a traditional mattress.

The softness and hardness of memory foam mattress determines its comfort. The firmness of the mattress is measured in terms

of a rating that is known as the foam's indentation force deflection (IFD). But, this isn't an accurate measurement of the

mattresses firmness. The higher the IFD of the foam is the lower density can feel soft when it is compressed.

IFD measures the force that is required to make a dent 1" into a foam sample 15" x 15" x 4" by an 8" diameter which is known

as IFD @ 25% compression. Many mattresses that are made of memory foam are firm. There are some reports that IFD is not a

good way to measure the softness of memory foam. The foam density as a measure of quality is important, but not always true.

Memory foam has an open cell structure that reacts to body weight and heat by molding to the body which helps to relieve

pressure points which prevent pressure sores. Although most memory foam are made from the same basic chemicals the layer

thickness and the density of the foam means that mattresses often feel different from one to another. A mattress that

exhibits a high density will have a much better rating of compression over its lifetime. The lower density mattress will

suffer from slightly shorter life as a result of the compression that occurs following repeated usage.

Cell structures vary from nearly closed to very open. The tighter the cell structure, the less airflow there is through the

foam. Some memory foam has a reputation for being very hot to sleep on. Breathable foam has a more open cell structure, which

allows lower odor retention at packaging, better recovery, and a higher airflow. The cell structure has little to do with

faster or slower recovery.

Very high levels are seldom used in mattresses with the exception of Tempurpedic. The amount of memory foam also has an

effect on the capabilities of the topper or mattress. Anything less than 2" won't have much of an effect, but a 6" block

would be too dense and soft to sleep on comfortably. Therefore, each mattress is a combination of its type, density, and

height each of which will have different properties.

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