Serta's iComfort Quilted Hybrid Collection combines Cooling Specialty Foams with Premium Individually Wrapped Coils then topping with a, more traditional feeling, Quilted Cover, with cooling features like the Max Cold™ Cover and the UltraCold System™, assuring you sleep cooler. Every iComfort mattress includes exclusive Carbon Fiber Memory Foam. This system channels heat away from your body and provides exceptional strength for back and neck support. Multiple layers of cooling Memory Foam adds to the comfort and support. This Medium Mattress works well for a back, side or stomach sleeper.