The Rockwell hybrid mattress delivers supremely indulging comfort. It is made with the world’s finest materials, like 4 centimeters of Indulge Memory Foam for pressure relief and IntelliCoil, the coil-within-coil support system that allows sleepers of all body types to find the perfect level of support. This mattress also includes two 1” layers of Premium Extra Soft Gel Memory Foam. The stretch-knit covering with Tencel is designed to wick away moisture and keep you comfortable, while the ventilated coil system works with external air vents to increase breathability and promote cool sleep. The plush comfort level is ideal for back and side sleepers. This mattress is compatible with 9” and 5” Sterns and Foster foundations.