memory foam

Memory foam was developed in 1966 to improve the safety of aircraft cushions. The temperature-sensitive memory foam was initially referred to as “slow spring back foam”; it also called temper foam Created by feeding gas into a polymer matrix, the foam has an open-cell solid structure that matches pressure against it, yet slowly springs back to its original shape.  
Including it in both medical equipment such as X-ray table pads and sports equipment such as  helmet liners.
Memory foam was subsequently used in medical settings. For example, it was commonly used in cases where the patient was required to lie immobile in their bed on a firm mattress for an unhealthy period of time. The pressure on some of their body regions impaired the blood flow to the region, causing pressure sores or gangrene. Memory foam mattresses significantly decreased such events.[2] Claims have also been made that memory foam reduces the severity of pain associated with fibromyalgia.
Mattresses
A memory foam mattress is usually denser than other foam mattresses, making it both more supportive and heavier.


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