Memory Foam

Memory foam consists mainly of polyurethane with additional chemicals that increase its viscosity and density. It is often referred to as "viscoelastic" polyurethane foam, or low-resilience polyurethane foam (LRPu). The foam bubbles or 'cells' are open, effectively creating a matrix through which air can move.

Higher-density memory foam softens in reaction to body heat, allowing it to mold to a warm body in a few minutes.
Newer foams may recover their original shape more quickly.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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