At my local furniture store they wanted over two thousand dollars for a mattress they said would ease my shoulder and hip pain.  But I got this instead, and my pain is gone!  It took only about three hours to puff up to its full height.  The only problem is that although my fitted bottom sheet just barely fits over it, ii's so tight that it smashes it down.  So I just use my mattress pad as a bottom sheet because it is bigger.