This is the pillow that prevents nighttime overheating using patented technology developed for NASA. Embedded in the pillow shell are millions of invisible microcapsules that absorb excess heat and move the warmth away from the head and neck until the pillow achieves a comfortable room temperature. When the sleeper shifts positions, the vacated area of the pillow recovers its cooling properties. The cooling feature is effective even under a pillowcase. Filled with a 100% visco elastic memory foam core and covered with a removable, jacquard-embossed polyester cover that is hypoallergenic and machine washable. White. 23" L x 15" W x 5" D.