Serta’s Applause ll Firm is a hybrid mattress that combines the feel and firmness of springs with the benefits of EverFeel Triple Effects Gel Memory foam. The Duet Edge individually wrapped coil support system offers the familiar feel of a traditional firm mattress. EverFeel Triple Effects Gel Memory foam has the feel of traditional memory foam, but was created to respond to the needs of your body as you sleep. The magic happens with millions of gel beads that are infused into the mattress material. The gel beads provide pressure point relief as they constantly adjust to your position at night. This means attention to body alignment from any angle. This technology also pays attention to temperature regulation. By combining these two technologies into a hybrid mattress, Applause ll Firm, that gives a firm feel to your body as well as attention to the unique needs of your body.