Big fan of this rug pad.  I bought one for a 3x5 wool rug in my tile Mudroom in hopes it would stop me having to straighten the rug all day long when my 60lb dogs run in and out of the house.  Works like a charm!  Immediately bought another that I cut to put under a runner in my hallway and mat inside my front door, both wool rugs on wood floors.  I never have to straighten any of the rugs anymore.  Very happy with both purchases and the price is great.  Highly recommend if you need something to keep a high traffic rug from budging.  Adds a nice cushion under foot too.