Serta has created iComfort Hybrid Mattresses that combine the best of Coil support systems with the best cooling Memory Foam, featuring EverCool® Fuze Gel Memory Foam and Carbon Fiber Memory Foam. By inserting Carbon Fibers within the Memory Foam, heat is channeled away from your body while the Memory Foam provides exceptional strength for your back and neck support. An advanced Individually Wrapped Coil system adapts to your body for ultimate support and durability. These coils are encases in a dense foam for added edge strength and greater mattress surface use. The iComfort CF1000 Hybrid Medium Mattress is ideal for a back, side or stomach sleeper.