Mattress system and method

A mattress comprising:

• a core unit having first and second side portions spaced in a parallel relation, and third and fourth side portions spaced in a parallel relation and perpendicular to each of the first and second side portions, the core unit comprising:
• a first cover defining a first internal region;
• and
• a first encasement disposed in the first internal region, the first encasement defining a second internal region;
• a plurality of core cartridges removably disposed within the second internal region, each of the core cartridges having a firmness characteristic, each of the core cartridges comprising:
• a plurality of springs;
• a sleeve in which the springs are wrapped, the sleeve defining first, second and third sides;
• and
• a label coupled to the first, second and third sides, the label comprising:
• at least one of a color code and a symbol, the at least one of the color code and the symbol indicating the firmness characteristic of the core cartridge;
• and
• first and second cushion panels, wherein the core cartridges are disposed between the first and second cushion panels;
• and
• a topper unit removably coupled to the core unit, the topper unit comprising:
• a second cover defining a third internal region;
• a second encasement disposed within the third internal region, the second encasement defining a fourth internal region;
• a first topper cartridge removably disposed within the fourth internal region;
• and
• a second topper cartridge removably coupled to the first topper cartridge and removably disposed within the fourth internal region;
• wherein the respective firmness characteristics of the core cartridges are based on a plurality of customer-specific parameters, the plurality of customer-specific parameters comprising:
• a first group of customer-specific parameters specific to a first person;
• and
• a second group of customer-specific parameters specific to a second person;
• wherein the plurality of core cartridges comprises:
• a first group of core cartridges having respective firmness characteristics based on the first group of parameters, the first group of core cartridges being disposed between the first and second side portions and between the third and fourth side portions;
• and
• a second group of core cartridges having respective firmness characteristics based on the second group of parameters, the second group of core cartridges being disposed between the first and second side portions and between the third and fourth side portions so that:
• the second group of core cartridges is disposed between the first group of core cartridges and the fourth side portion, and
• the first group of core cartridges is disposed between the second group of core cartridges and the third side portion;
• 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;
• wherein the first group of core cartridges is generally aligned with the first topper cartridge;
• and
• wherein the second group of core cartridges is generally aligned with the second topper cartridge.