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What to Look For in a Hybrid Mattress Double A hybrid mattress double gives you a slumbering night's sleep as well as the cushioning comfort of springs and foam. It provides optimal support and contouring comfort to promote healthy spinal curvature. A hybrid mattress typically features a layer of memory foam or latex on top of a steel coil base. This helps reduce pressure and conforms to the body, unlike traditional innerspring mattresses that tend to sag. Comfort Hybrid mat