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A memory foam mattress is usually denser than other foam mattresses, making it both more supportive and heavier. Memory foam mattresses are often sold for higher prices than traditional mattresses. Memory foam used in mattresses is commonly manufactured in densities ranging from less than 24kg/m 3 (1.5 lb/ft 3 ) to 128kg/m 3 (8 lb/ft 3 ) density.
An expiration date or expiry date is a previously determined date after which something should no longer be used, either by operation of law or by exceeding the anticipated shelf life for perishable goods. Expiration dates are applied to some food products and other products like infant car seats where the age of the product may affect its safe ...
The pocketed coil is the basis for the Simmons Beautyrest mattress brand, which was introduced in 1925. [6] Although the new manufacturing technology greatly reduced its cost, at the time of its introduction a Beautyrest mattress sold for $39.50, three to four times more than the typical price for a standard wire mattress. [7]
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High density foam Similar to memory foam mattresses, a high density foam mattress uses a more compact foam typically made from polyurethane. This kind of foam is made largely from open cells that are packed together tightly. [24] High density foam mattresses offer comfort and longevity because they are more dense than a traditional foam mattress.
The company was founded in 1931 in Illinois as Sleeper, Inc. by 13 mattress manufacturers who licensed the Serta name. Subsequently, eight independent licensees acting like a cooperative owned the company. Afterwards, it was controlled and operated as Serta International by its largest licensee, National Bedding Company, which ultimately held ...
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