Featuring the exceptional motion separation and back support of 800 density Beautyrest Pocketed Coil Springs, Luxurious BeautyStle stretch knit fabrics and aesthetics, Patented Transflexion Comfort Technology ensures comfort throughout the life of the mattress, Total Surround BeautyEdge Foam Encasement with QuantumLock adds foam rail itengrity and sleeping comforto right to the edge, Energy Foam, part of Simmons' patented no-flip construction, adds greater stability.