I recently fractured my spine in two places.  Rather than move into the guest room with cushion top mattresses that felt far more comfortable than my Tempurpedic, I hoped this mattress pad would do the trick.  It is made extremely well with deep stretchy pockets for any size mattress and thick, dense material which provides the loft in the pad.  It does not make my Tempurpedic feel like a cushion top, but my first night was without tossing and turning and I was not hurting when I awoke.