Air mattress. In Europe and North America, mattress makers have begun incorporating gel-infused foams, soft-solid gels layered over foam, and poured gels in the top comfort layer of the bed. National Bed Federation. Center for the Polyurethanes Industry.
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Retrieved 6 March Retrieved Mattresses require a solid foundation which does not itself sag — a sagging foundation, such as by weak slats on a wide bed, will in turn cause the mattress to sag.
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Mattresses require ventilation to remain dry and prevent mildew, and thus should not be placed directly on the air bed bed discount foam foam latex mattress or on a solid surface — slats or a box spring provide space for airflow, while solid wood or plywood as in cheap bunkie boards does not. Popular in Europe, a divan  incorporates both mattress and foundation in a single upholstered, footed unit. Double mattresses are available with a softer and a firmer part, or with adjustable firmness levels, to accommodate sleepers with different preferences who share a bed. Word History. An industry-funded study by researchers at Oklahoma State University funded by the BSC  of 59 people with poor sleep who received free new replacement mattresses for their existing mattresses 5 years or nude mindy clarke average age 9.
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