Malouf Gel Dough Memory Foam + Z Gel Pillow. Offering a unique approach to combat heat, the Gel Dough® + Z™ Gel pillow integrates two technologies to ensure a cool night of rest. On top of the pillow, a liquid Z™ Gel layer captures and dissipates body heat. The body consists of unique Gel Dough®memory foam that creates a cooler, softer material and offers an optimal thermal experience. Accompanying the pillow is a luxuriously soft rayon from bamboo velour cover, excellent for sensitive skin and temperature regulation.