We ordered this to go under a large area rug.  It says it is guaranteed not to damage floors but after a week or so if it being in use we pulled up a section and found that it left a very sticky residue on our hardwood floors. The residue comes off with mopping but it definitely leaves me Concerned about the long term impact of this sticky material once it ages.  Actually both sides of the pad are quite sticky.  When we were laying it down initially our dog walked across it and she had to actively pull her feet off.  It was pretty funny to watch but I think this manufacturer may have taken the “nonslip” a bit too far. 

 We also ordered a wayfair basics rug pad for a hallway rug at the same time as the above pad and I am more pleased with the Wayfair pad.  It is thickly padded and feels good under your feet.  When I lift the rug pad there is no sticky residue on the floor.   Everyone in our house has commented on how good the hallway rug feels