Memory Foam Mattresses
Memory foam is made from polyurethane with additional chemicals that increase its viscosity level, thereby increasing its density. It is often referred to as visco-elastic polyurethane foam. Depending on the chemicals used and its overall density, it is firmer in cool temperatures and softer when warm. Higher density memory foam reacts to body heat which allows it to mould itself to the shape of a warm body within a few minutes. A lower density memory foam is pressure-sensitive and will mould more quickly to the shape of the body.
Memory foam was originally developed in 1966 under a contract by NASA's Ames Research Center as a way to improve the safety of aircraft cushions. Ames scientist Chiharu Kubokawa and Charles A. Yost of the Stencel Aero Engineering Corporation were major contributors to this project. Yost named the temperature-sensitive memory foam 'temper foam'.
Yost later founded Dynamic Systems Inc. in collaboration with NASA to commercialize the foam, including it both medical equipment such as X-ray table pads and sports equipment such as football helmet liners. After Dynamic Systems sold its line of memory foam products to the Edmont-Wilson division of Becton, Dickinson & Co. in 1974, this company expanded to an even wider range of products.
When NASA released memory foam to the public domain in the early 1980s, Fagerdala World Foams was one of the few companies willing to work with the foam, as the manufacturing process remained difficult and unreliable. Their 1991 product, the "Tempur-Pedic Swedish Mattress" eventually led to the international mattress and cushion company, Tempur World. Other companies now based on the foam include Advanced Comfort and Contour-Pedic Sleep Inc.
Memory foam was never used in the space program but was subsequently used medically, for example by patients who used to lie in bed on hard or very firm mattresses for long periods of time without regularly moving such as being bed-bound after a paralyzing stroke. The pressure over some of their bony regions decreased or stopped the blood flow to the region causing pressure sores and/or gangrene. Memory foam mattresses helped remarkably to decrease such events.
Memory foam was initially too expensive for general use, but in recent years it has become cheaper to produce and is now widely available. Its most common domestic uses are mattresses, pillows, and mattress toppers. It still has medical uses, such as wheelchair seat cushions, hospital bed pillows and padding for persons suffering long-term pain or postural problems; for example, a memory foam cervical pillow may alleviate chronic neck pain. Its heat-retaining properties may help some pain sufferers who find the added warmth helps to decrease the pain.
Memory foam needs Latex
Earth friendly. Latex will not destroy the environment.
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The industry pushes memory foam because it's easily made in laboratories. Whereas latex is naturally made by nature.