Perfect Sleeper Luminous Sleep offers enhanced pressure-relieving comfort thanks to three layers of exclusive Serta foams, HexCloud Gel Memory Foam, WonderCloud Memory Foam, BubbleCloud Foam, and the 1000 Edition Custom Support Coil System. This top-of-the-line mattress delivers the ultimate comfort experience with the addition of an anti-microbial, cool-to-the-touch sleep surface to help you get the restorative sleep you’ve been missing. Serta Support Foam offers a medium comfort level on this hybrid tight top mattress.