I had a 3" topper on an old mattress to extend the live of it which did the job and we loved the comfort. I finally tossed the old Mattress and Box spring as well as the old topper. The new mattress is nice and very firm but I missed the Memory foam topper. I didn't feel I needed a real thick topper with the new mattress and opted for this 2 inch model. With Overstocks very fast shipping this topper arrived in 2 days from time of order, can't beat that. Opened it late afternoon to let it air only for a few hours and put it on the bed that same night. No offensive smell at all maybe a light hint of mint but that was it. With putting it on a new mattress this 2in topper added just what I was looking for and I'm not sorry at all that I chose this one and saved money over the 3". If your mattress is old and sagging I'd buy at least a 3" if not a 4" topper with a minimum of 3lbs density. if you're looking for a little more comfort on a mattress that is in good condition this item fits the bill.