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The density of most memory foam mattresses ranges from 4 to 5 pounds per cubic foot, Memory Foam Mattress.org says. Densities can vary from 1.5 pounds to as high as 8 pounds, and the higher the density, the longer the mattress will last, according to Select Foam Mattresses.
Source:
Memory Foam Mattress.org: Memory Foam Mattress Information, Comparison and Buying Tips
Select Foam Mattresses: The Original Memory Foam Mattress Buying Guide
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