Serta's iComfort Collection of Mattresses offers you all foam, Gel Memory Foam Mattresses. A high density foam support core is problem free with the extra dense Ultimate Edge® allowing you to sleep close to the edge of the mattress with out rolling off. Layers of Gel Memory Foam molds to your body, both supporting you and relieving pressure. Enjoy the benefits of sleeping on a Gel Memory Foam bed. Sleep has never felt so good.