Contour Gel Dough + Z GelUniquely combining three pillow technologies, the Contour Gel Dough + Z Gel pillow offers maximum cooling and comfort. A layer of Z Gel extends over the entire surface of the pillow to capture and dissipate heat. Underneath the Z Gel is soft memory foam shaped in an ergonomic contour design that correctly aligns the spine. Accompanying the pillow is a luxuriously soft rayon from bamboo velour cover, excellent for sensitive skin and temperature