Discover the luxury of the Millennium twin XL hybrid mattress. Two layers of temperature-regulating material keep you at a comfortable temperature all night long. Copper-infused memory foam contributes to the cooling performance, and wrapped coils keep your mattress fresh. Contouring comfort foam and wrapped coils deliver amazing support, pressure relief and comfort. In addition, the premium pressure-sensitive NanoCoil unit and individually wrapped coil pack help to provide a great night's sleep.