Keeps my over-pronating feet well seated. Reasonable arch - I have flat feet and that will never change. It's been a long road to recovery from plantar fasciitis  in both feet, and I can wear these for walking 3-6 miles and know that tomorrow, I will walk again somewhat pain free.  My only beef is that the mesh fabric easily catches on everything and anything and rips, tatters and looks bad in a very short period of time. It's not my preference, but I can live with this as I have purchased third pair.