We were looking for some extra padding to go on top of our select comfort bed and took a risk on this 4" mattress topper. The odor is toxic. It took 4 days and lots of fabreeze and neutra air to eliminate the odor that permeated our house. Once we were able to use the topper, we were in love. I am very boney and this topper allowed me to get a great nights sleep. While it's thick, the topper also firm. It's very heavy....be prepared to get help moving it.