The Zinus Spa Sensations 4 inch Cooling Gel Memory Foam Mattress Topper, Adult, Full enhances mattress comfort with cooling, conforming memory foam. It regulates body temperature to keep you cool all night long, relieves stress on your pressure points, and contours for full support everywhere it's needed. This topper is CertiPUR-US Certified for quality and comes with a 5-year warranty. Please open your gel mattress topper package within 72 hours of receipt and allow 48 hours for your new mattress topper to return to its original, plush shape.