System and method for customizing a mattress

A mattress, comprising:

• a first layer;
• a second layer supported on the first layer and arranged abutting the first layer;
• and
• a third layer including a first longitudinal end and a second longitudinal end and having a substantially arch shape, the third layer including
• a first portion extending in a longitudinal direction from a location proximate to the first longitudinal end towards the second longitudinal end and completely embedded, in a vertical direction, inside the first layer, and
• a second portion extending in a longitudinal direction from the first portion towards the second longitudinal end and at least a part of a length of the second portion is completely embedded, in the vertical direction, inside the second layer,
• wherein the third layer includes one of a plurality of coils arranged in a grid pattern, a plurality of cavities arranged in a grid pattern, a non-woven thermoplastic sheet having heat bonded strands, or a woven thermoplastic sheet having heat bonded strands.