Listen everyone...this works PERFECTLY as a mid layer when you have a situation where you have an area rug on top of a thick, upside down rug pad.  This pad will do two wonderful things...(1) keep the rug from shifting on top of the thick pad AND another wonderful surprise...(2) make the area rug surface feel soft and comfortable to lay on it (i.e. the thick upside down pad made it feel hard until I put this pad between them.)  Was quick and easy to cut to fit.  LOVE IT!