There are a lot of things you can"t control while travelling, don"t let your temperature be one of them. The Gel Dough® + Z-Gel™ pillow offers a unique dual gel approach to combat heat. The Z-Gel™ lies on top of the pillow for a cool sleeping surface that will capture and dissipate your heat. The 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.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.The super soft cover is made from bamboo velour and is removable for easy washing. We back this product with a 5-year warranty that covers all manufacturer defects.