Find the ultimate comfort with the all new King Koil Gracelyn Mattress! Product Features: AdvantaGel ™ – Intelligently designed infusion of gel and resilient foam offers a cooler sleep with luxurious comfort and durability. eXtended Life Foam-A higher quality, higher density foam that increases durability, helping reduce body impressions over the life of the mattress. Latex Lumbar Support – The center third of the mattress is reinforced with a conforming latex to provide pressure-relieving support to your lower back. Contour Luxury Plus EC – Individually encased coils are designed to separately respond to the body, reducing motion transfer; so when your partner moves, you can still enjoy an undisturbed night's sleep.