Serta Gel Memory Foam - This unique gel memory foam contours to the body for cushioning comfort and allows airflow to keep you cool and comfortable throughout the night. Serta Transitional Support Foam - This foam support layer provides all-over body support and long-lasting comfort. Serta Foam Core - Our new and improved Serta Foam Core provides durable support for any sleep position. With consistent support from edge to edge, you'll be comfortably supported all night long.