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.