Patent ID: 8356371

Claim:
A mattress, comprising: first and second sides spaced in a parallel relation; third and fourth sides spaced in a parallel relation and perpendicular to each of the first and second sides; and a plurality of core cartridges, comprising: a first group of core cartridges having respective firmness characteristics based on a first group of parameters, the first group of core cartridges being disposed between the first and second sides and between the third and fourth sides; and a second group of core cartridges having respective firmness characteristics based on a second group of parameters, the second group of core cartridges being disposed between the first and second sides and between the third and fourth sides so that: the second group of core cartridges is disposed between the first group of core cartridges and the fourth side, and the first group of core cartridges is disposed between the second group of core cartridges and the third side; wherein the second group of parameters is different than the first group of parameters and thus the combination of the respective firmness characteristics of the second group of core cartridges is different than the combination of the respective firmness characteristics of the first group of core cartridges.