Bib Nl - 12" Pro Gel Hybrid Medium MattressPerformance Heat & Wicking Fabric: Helps regulate temperature while you sleep by moving heat and moisture away from the skin surface. Responsive Gel Memory Foam: Adapts to your body contours providing comfort & support for proper spinal alignment and pressure relief while allowing heat to move away from the body to keep you cool and comfortable. CertiPUR US High Density Comfort Layer: Gives your body the support it needs for proper spinal alignment