I was surprised to feel a huge difference when I set this on top of my full sized spring mattress, super comfortable now. I was beginning to feel the springs of my mattress, and now with this I don’t even notice. The topper smell is strong at first, I recommend you leave it air out for the days it recommends before you sleep on it unless the smell doesn’t bother you that much, other than that this thing is tops . Also shipping was fast.