Reddit reviews Zinus Sleep Master 2 Inch Memory Foam, Short Queen Mattress Topper,

2 inches ventilated memory foam for ideal pressure relief and supportRejuvenate your mattress with memory foam comfortOnly the highest Quality memory foam - memory foam is CertiPUR-US certified for durability, performance, and ContentSmartly Shipped-Our patented technology allows our mattress toppers to be efficiently compressed, rolled and shipped in a box conveniently to your door; Worry free 5 year limited warrantyToppers typically take 48 hours to expand, sometimes longer. Other factors, like cold weather, can also affect decompression times. Please allow up to 48 hours for your mattress topper to fully expand and for any potential odor to dissipate