Got the big bump the other day, and let me forewarn you, don't unwrap it if you think you might return it. It is so compressed, you'ld need machinery to put it back in the box. I noticed a light odor, but nothing offensive and it dissapated within a few days. I did'nt give it time to air out outside. I laid it out on the king size bed for most of a day to expand fully, and then put it on. I was very pleased with the size; it was a perfect king fit edge to edge. Don't let the ad fool you, you're going to feel warmth; not sweaty warmth, but there isn't much in the way of air circulation keeping you cool You feel it as soon as you get comfortable. It isn't the Tempurpedic memory foam from the tv commercials; it isn't that good, but it is better than just foam rubber. I got the 3in thickness and no doubt 2in would not have been sufficient. It is more comfortable than just a good mattress or a pillow top mattress, and for the money, it is a good value. Just don't have Tempurpedic expectations.