Serta Arctic Cooling Mattress ProtectorDescription The Arctic Cooling Mattress Cover Protector was developed to be 5x cooler than standard non Reactex products to help you sleep comfortably and covered throughout the nightespecially when combined with other products in the Serta Arctic system. Reactex technology provides pressure activated cooling in approximately 8 seconds. Heat is pulled away from the surface of the mattress and is stored away from the body to help maintain optimal sleep