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Memory foam is a commonly used material in mattresses. It is a dense, viscoelastic polyurethane foam that molds to your body and provides a unique feel. In order to have any measurable benefit to the sleeper, the memory foam material needs to be at least two inches thick and as close to the sleeping surface as possible. Original Mattress Factory puts a strong focus on the density of our memory foam beds. We use 3.5 lb. density, 5 lb. density, and 8 lb. density memory foam in our products, which are some of the highest-quality and densest foams available on the market. Additionally, all memory foams that are used in OMF’s products are manufactured in the U.S., are CertiPur Certified, and adhere to strict quality and safety standards. Our Serenity line features three all-foam mattresses. We also offer two Hybrid mattresses: one in our Regency line and one in our Orthopedic line. Both hybrid options combine our high density memory foam with a quality innerspring for a truly unique feel.