Importance

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Abstract

A zoned foam mattress includes an upper foam layer and a zoned foam layer. The lower side of the upper foam layer is adjacent to the upper side of the zoned foam layer. The zoned foam layer has first, second and third lateral regions with the second region being disposed between the first region and the third region. The first lateral region is disposed at the head end of the mattress. The first and third lateral regions are formed from high-density polyurethane foam (HD foam), whereas the second lateral region is formed from visco-elastic polyurethane foam (memory foam). A person's shoulder can sink farther into the second lateral region than into the first or third lateral regions even if all of the lateral regions have the same indentation load deflection (ILD). By allowing a person's shoulders and hips to sink into memory foam regions, the person's spine is kept straight.

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First Claim