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The Blue Fusion 4000 combines the plush, cushioning comfort of a pillowtop mattress with Sertas most advanced temperature regulation technology. The combo of TempActiv Gel Memory Foam and a layer of EverCool® Fuze Gel Foam promotes enhanced airflow and pressure relieving comfort. The Blue Fusion 4000 is finished with TempActiv Touch Fabric for an immediate cool-to-the-touch feeling that helps dissipate heat throughout the night.