The corners of the mattress are ANYTHING BUT square.  In fact all 4 corners of the mattress are "mashed" and have never expanded to look like a "crisp" corner.  If I hide it with a comforter, perhaps it won't show but it really does look pretty pathetic.  If i would have paid anywhere close to full price i would have sent it back.  Definitely not the quality of other "mattresses in a box".