An excellent choice for those who enjoy the extra firm support of a restorative mattress, the Beautyrest Black Calista delivers a supremely firm, contouring feel. Utilizing Advanced Pocketed Coil Technology, Beautyrest's most durable and conforming coil technology yet, this mattress helps to provide individualized back support with superior pressure point relief. Directly above the innerspring system is a layer of Micro Diamond Memory Foam, an exclusive material which utilizes the properties of diamond particles to move heat away from the body. Layers of Energy and Comfort Foams help to create a supportive, body-contouring feel, while a layer of GelTouch Foam at the sleep surface provides soothing comfort with exceptional conformability. 10 Year Warranty.