With the Edge 4000 Ultra Plus, quality sleep equals quality life. Continuous sculptured channels in the gel-infused poly quilt layers promote air exchange and a more refreshing, cooler night's sleep. CoolTEX Thermocool ticking is engineered to keep you cool, dry and comfortable. Thermocool technology is cool to the touch and wicks away moisture. Innersprings sleep up to 28% cooler than foam according to research from Kansas State University and the Institute of Environmental Research. Quantum Edge Steel Perimeter outperforms foam encasement offering longer comfort life, better support while reducing the feeling of rolling off, and is 26% more durable. It bends an average of 24% more easily than foam encasement, which means less wear and tear on moving parts and a more "friendly" performance on adjustable bedbases.