EvenCool™ Fabric. Designed to keep you cool and comfortable all night long. Fire Shield® Fiber. Gentle Support™ Aire. ½" Gentle Support™ Foam. 2" 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.