The Kingsdown Prime Collection offers comfortable, supportive mattresses at exceptional values. Each mattress includes Serene® Foam, an alternative to Memory Foam, that adjusts to each person, providing exceptional Lumbar Support while it dissipates heat. Gel Foam adds additional support and aids cooling the surface. Tri Zoned Individually Wrapped Coils, provide individualized support with additional support in the center third. Coils are surrounded with firm foam providing a sitting edge and full use of mattress surface. A luxurious quality mattresses at a great value!