EverCool® Fuze Gel Memory Foam - A fusion of cooling gel within premium memory foam, this special blend promotes cooling by increasing airflow and dissipating heat., Cool Twist® Gel Memory Foam - This unique design features cooling gel swirled into premium memory foam that helps enhance airflow and heat dissipation for a cool, contouring type of comfort., Serta Comfort Last® Support Core with Ultimate Edge® Encasement - A premium foam support core featuring high-firmness form sides for strengthened edge support and durability., Serta® PillowSoft® Foam - A special extra- soft foam that gently hugs your body in a comfortable embrace.,