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Why Buy a Mattress Double Memory Foam? Double memory foam mattresses provide the most comfortable sleep. They are breathable, temperature regulating and provide motion isolation. This is perfect for sleepers who are light or who are disturbed by pets or partners fidgeting. This material was originally developed for astronauts. It provides comfort and support while allowing blood to flow freely. It is hypoallergenic and resists the accumulations of dust and mites fungus, and other common allergens.