Sinweek 2-Inch 5-Zone Memory Foam Mattress Topper, Us Certified. TOTAL PRESSURE POINT RELIEF: Unique 5-zone design is optimized to provide compliant support across the entire body (head and neck, torso, hips, upper legs, feet and calves). Our swirl memory foam mattress topper readily conforms to the curves and shape of your body and distributes weight evenly to alleviate pressure points for better sleep. GEL MEMORY FOAM: Our gel memory foam topper reduces heat and improves airflow for refreshing breathability. Add it to your mattress for customized comfort. GREAT WAY TO UPGRADE AN OLD MATTRESS: A comfortable and affordable way to fix a sagging mattress, soften a hard mattress, or prolong your mattress life. Instead of buying an expensive mattress, our mattress topper won?t cost you an arm and a leg. CERTIPUR US CERTIFIED: Our Gel Swirl memory foam topper is made of CertiPUR-US certified materials. The Gel Swirl memory foam topper meets or exceeds standards for content, emissions, and durability. BEFORE FIRST USE: leave the memory foam flatly in a well ventilated area for 48-72 hours until it?s fully expanded. Tips: Low temperature may need more time, find a suitable temperature(78?) will shorten the time.