EvenCool™ Fabric designed to keep you cool and comfortable all night long. Fire Shield® Fiber. Gentle Support™ Aire. Gel Active® Gel Foam. 850 IWC System with Coil Encasement. Individually wrapped coils isolate motion and lessen the disturbance of a sleep partner. Steel coils and edges provide superior edge support. Coil encasing supports the perimeter of the mattress and increases the life of the mattress since the edges receive the most compression and show wear first.