The GEL DOUGH Z GEL pillow offers a unique dual gel approach to combat heat. A layer of liquid Z GEL lies on top of the pillow for a cool sleeping surface that captures and distributes body heat for a cooler night's sleep. DOUGH memory foam is also infused with Z GEL for a combination that offers an optimal thermal experience. The unique GEL DOUGH memory foam formula creates a softer, cooler, doughier memory foam. Offering you lasting comfort and support, the Z formula produces a superior, softer foam that is still firm enough to support the natural curves of your head, neck and shoulders. It's molded, not cut, making the pillow more effectively conform to your weight and pressure for individualized comfort. Because memory is able to adjust to your natural pressure points and helps to align your spine, it's renowned for its abilities to ease sleeping aches and pains. Initially the pillow is firm, but then your head and neck will sink slightly for excellent support and comfort. Accompanying this pillow is a Tencel removable cover with superior moisture-management properties aids in optimal sleeping temperatures. The cover is removable for laundering, helping you to create a healthy sleeping environment. Comes with a 5-year U.S. warranty that protects the pillow and cover against manufacturer's defects. Fill: 100 percent polyurethane gel foam