As most of the reviews are comments about the box, it appeared to be in WWIII. I unpacked the mattress and and it grew to the full 12". I was shocked with some reviews saying that is was only 10". The mattress is very comfortable with hardly any motion. There was no smell to the mattress at all. As of now,  I am very happy with the mattress. Hopefully it will not disappoint me in the future. I would highly recommend this mattress to anyone seeking to buy a hybrid. For the money, it'll be hard to beat.