We use 2 inches of our Serta gel memory foam, that cradles you with comfort and provides airflow to help keep you cool throughout the night. A thick layer of our Serta Foam Support Core (no coils) provides a medium feel and durable support for any sleep position. Consistent edge to edge support is provided by our Foam Support Core We've used new compression technology to package your mattress in our smallest carton yet! Easy set up- just unpack, unroll, and unwind! Worry free 100 Night Sleep Trial and 10 year limited warranty!