The Aria Hybrid Plush Mattress brings you great comfort and longer wear. True to the Hybrid definition, this mattress combines traditional Individually Encased Coils, which adjust to your body giving you unmatched support, along with layers of Specialty Foam, for cradling, pressure relieving comfort. Top layers include Gel Foam and Serene® Foam, providing a cooler sleep surface. This is an excellent mattress for a back or side sleeper.