Memory Foam Mattress Specifications

Foam Layers

• All memory foam mattresses are constructed of several layers of foam. The more costly mattresses have more than one layer of memory foam and a base layer comprising regular foam or low-density memory foam. Less-expensive mattresses have a top layer of memory foam and a thicker bottom foundational layer of regular foam.

Depth and Density

• Variety exists in the depth and density of the memory foam material. Depths vary from 2.5 cm to 12.5 cm, and density can support approximately 2 to 5 lbs. per cubic foot. Optimal support is achieved by a depth of 7 cm and density of 3 to 4 lbs. per cubic foot. Exceeding these measurements does not enhance comfort or benefit. Mattresses with lower-density memory foam can sag and do not provide adequate body support.

Warranty and Price

• The terms of warranties vary widely. The more costly brand-name memory foam mattresses offer a warranty. A non pro-rated warranty repairs or replaces the mattress free of charge, excluding transportation costs. Less-expensive models offer a limited or no warranty.