Restful, relaxed and comfortable sleep is vital for the good health of body and mind. Visco-Elastic Cellular Polymer - which has the desirable qualities of being both energy absorbing and temperature sensitive. This high density material responds to natural body heat and forms to the body's shape, creating a reflection of the body contours. No matter what the body weight, the Memoryflex mattress spreads the sleeper's weight so that when equilibrium is achieved, the sleeper is subjected to the least possible pressure. This promotes greater sleeping comfort and relief to joints and muscles, whilst also improving circulation. This reduces the need to toss and turn throughout the night, eliminating unnecessary wear and tear on the sleeper and so further enhancing sleep quality. The Heathbeds Memory Flex mattress comes with a cool max unzippable cover