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There are three thicknesses available in the Sealy memory foam mattress in a box collection. Each thickness has a different combination of memory foam layers that encourage ventilation and offer conforming comfort, pressure relief, and support to keep you comfortable all night long. One of the features is a high-quality, pressure-relieving gel memory foam that molds to your body. Reactive comfort foam, which minimizes motion transfer while maintaining just the proper amount of responsiveness to avoid sinking, is a feature of mattresses. The comfort of a foam mattress in a box is delivered right to your home. After putting your mattress on your bed and taking the packaging off, give the bed some time to expand into its cozy, lofty shape.