Memory foam was originally developed by a Swedish company, Tempur-Pedic, for
NASA to use in the space programm. NASA adopted memory foam because of its
ability to distribute pressure across the entire surface, thus easing the
pressure of extreme G forces.
Memory foam was subsequently used in medical applications, for example where a
patient suffered with pressure sores or had to be bed-bound for a long period of
time. Initially memory foam was too expensive for general use.
In recent years visco-elastic memory foam has become cheaper to produce and is
now widely available for the home bedroom. The most common domestic applications
of memory foam are in mattresses, pillows and mattress toppers (also known as
mattress pads).
A memory foam mattress is usually denser than an ordinary foam mattress. This
makes it more supportive - but also heavier. It is often seen as a good
compromise between the comfort of a soft mattress and the supportiveness of a
firm one.
When new, memory foam often gives off a distinct chemical odor which many people
find unpleasant. This fades with airing however some people remain sensitive to
it.
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