There are a lot of things you can't control while traveling. Don't let your temperature be one of them. The GEL DOUGH + Z Gel? pillow offers a unique dual-gel approach to combat heat. Ultra-cooling Z Gel? lies on top of the pillow for a cool sleeping surface that captures and distributes body heat. The memory foam is also infused with cooling Z Gel? for a combination that offers an optimal thermal experience. The proprietary GEL DOUGH memory foam formula creates a softer, cooler, doughier memory foam. The orthopedic design and our unique DOUGH formula creates a soft yet supportive memory foam to keep your neck properly supported. This pillow was created through open-cell technology to maximize durability and resiliency. A super-soft velour cover made of a rayon from bamboo blend is removable for easy washing. We back this product with a 5-year U.S. warranty that covers all manufacturer defects. Cover: 75 percent polyester, 25 percent rayon from bamboo Fill: 51 percent polyurethane gel foam, 49 percent polyurethane foam