Experience the best of Beautyrest(R) Black Series Four Firm Pillow Top Mattress, featuring advanced temperature management technology, Micro Diamond(TM) Memory Foam, Self-Response(TM) Latex, and advanced, Triple-Stranded Pocketed Coil(R) Technology for conforming support and motion separation. Two layers of 2K Nano Coils, for a total of 4K Nano Coils, offer a specialized upgrade as they conform to your body for enhanced, individualized support. With the inclusion of 4K Nano Coils plus additional layers of premium foams, the Series Four model is the most exclusive offering across Beautyrest Black(R) models. With the inclusion of premier materials and advanced sleep technology, Beautyrest Black(R) optimally aligns at the intersection of luxury and innovation for an extraordinarily comfortable sleep.