Renewable and configurable mattress

A mattress system comprising:

• a shell including a bottom and a peripheral wall defining a shell interior;
• a plurality of securement flaps attached to the peripheral wall, each of the plurality of securement flaps including a free portion extendable over the shell interior, wherein the free portion includes an inward side and an outward side opposite the inward side, wherein the inward side has a first fastener element thereon and the outward side has a second fastener element thereon;
• a core assembly removably received in the shell interior;
• a topper including one or more foam layers;
• and
• a top cover releasably coupled to the shell for covering the shell interior and the topper;
• wherein the first fastener element on the inward side of each of the plurality of securement flaps is releasably fastened to the core assembly;
• wherein the second fastener element on the outward side of each of the plurality of securement flaps is releasably fastened to the topper.