The Advanced Cooling Mattress Topper features a PerfectTemp™ cooling system, which helps maintain an ideal sleep temperature all-year round. Moisture-wicking technology in the cool-touch cover, temperature-regulating Phase Change Gel layered from head to toe, and breathable gel memory foam are combined to create our most premium cooling comfort. Cradling gel memory foam adapts to your body with personalized pressure relief, helping to align you in any sleep position. This helps prevent tossing and turning for longer periods of deeply restful sleep. Once you’re ready for a refresh, simply machine wash the cover for years of satisfyingly cool sleep.