I bought a pair of these a few months ago. I have plantar fasciitis and stand on concrete 12 hours a day. After a couple of weeks, I'd come to the conclusion that they were ok, I really wasn't sure they were worth the money though. Then about a week ago I had switched back to the brand I wore before these and within a couple of hours my knees and hips were killing me. My knees and ankles started swelling and had were so hot. I had these with me and put them back in my steel toes and a few hours later things started returning to normal. It took NOT having them on to realize how much they had helped with realignment. I'm sold and a Protalus customer for life!