I was impressed with both of these (the foam and its' cover) when I opened the box. It weighed a ton and was quite compressed. You have to be careful when undoing the rolled up foam so as not to rip at it as it is tightly balled up at its' core. I ordered a King size so I let it spread out on a bed in my spare room overnight and there was no lingering odor the next as others have mentioned here. My husband and I have slept on an older Serta mattress. This was not a pillow top, but an older type with inner springs. Then a few years ago, I purchased a 2 inch memory foam topper from O for more comfort. That worked nicely for us, but every time I stayed at a Country Inn Suite, I loved the comfort of their mattresses so much that I wanted to duplicate that kind of comfort without having to spend a ton of money so I ordered this particular product. I figured I'd throw it on top of my 2 inch foam for a 7 inch total. Well, this foam is softer than the 2 inch one I own. Too soft. I switched them and put the 2 incher on top of the 5 incher and it's perfect! Bottom line is this. If you don't like sinking in DON"T BUY because this is very soft and you'll sink in. If you do have another foam topper of 2 inches to throw on top of it, it's absolutely GREAT!