Exclusive Dough formula creates a softer, more supportive memory foam that conforms perfectly to your natural curves. A cooling liquid Z Gel layer extends across the top of the Dough memory foam, capturing and dissipating body heat for a cooler night's rest. 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 regulation.