Just got the mattress delivered today and have not had a chance to sleep on it yet. As I was getting the sheets on the bed I noticed on the bottom end the seams are not uniform. In other words both seams do not conform to the back. One seam is to the side and the other is to the back. I doubt that is the way you do all of the mattresses. For as much as I am paying for it I would guess that there would be uniformity.