Noun
memory foam (countable and uncountable, plural memory foams)
Foam consisting of polyurethane and other chemicals used in the manufacturing of pillows, mattresses, laptop sleeves, etc, which reacts to body heat and molds to the shape of the body.
Memory foam toppers range from 2.5 PCF or lower to 5 PCF or higher. Source: Internet
Ease of Moving and Rotating Memory foam mattresses tend to be lighter, which makes them easier to move. Source: Internet