An ergonomic U-shaped design correctly supports the natural curves of your head, neck and shoulders, providing ideal support for flights, cars, or buses. The liquid Z™ Gel lies on top of the pillow for a cool sleeping surface that will capture and dissipate your body heat, creating a cooler sleeping surface. The memory foam is also infused with Z™ Gel for a combination that offers an optimal thermal experience. The unique Gel Dough® memory formula creates a softer, cooler, doughier memory foam. The extremely breathable rayon from bamboo velour cover enhances the cooling effect, and is removable for easy laundering.