Serta Arctic Cooling Memory Foam PillowDescription This memory foam cooling pillow has been developed and tested to be 30x cooler than standard non Reactex pillows, helping you to sleep comfortably throughout the night. Reactex technology provides pressure activated cooling in approximately 8 seconds, as heat is pulled away from the surface of the pillow, then stored away from the body. When not in use, Reactex technology releases stored heat energy to prepare for the next night's use. The