Z Gel Infused DOUGH Memory Foam Pillow with Double Liquid GEL Packets - 5 Year U.S. Warranty - Standard - High Loft Unique combination of gel-infused foam with two liquid Z GEL packets provides the best temperature regulation for those who sleep hot Liquid Z GEL captures and dissipates your body heat for a cool and comfortable sleep Luxuriously soft and removable velour cover made of a rayon from bamboo blend Z gel-infused DOUGH memory foam formula creates a softer, cooler, doughier memory foam that supports the natural curves of your head and neck Open cell construction is more durable, breathable, and resilient to ensure a pillow that will maintain its shape over time; 5-year U.S. warranty