Okay, I wear a size 13 workboot everyday and stand on a concrete floor, those who do this will know what I'm talking about. I have tried every name brand boot out there trying to get some relief for my aching feet, Redwing, Wolverine, etc. My Mom got these for me after seeing them in the Redwing store, I was skeptical at first, but am now a firm believer!! I heated these things up per the directions, slipped them in my Wolverine boots, stepped in and laced them up. As simple as that!! The first couple of days they felt a little strange, almost like there was a golf ball under my arch, little did I know it was because I had gone years without enough support in my arch! My wife used to rub my feet almost every night, she commented the other evening about how it had been so long since I have asked her to do that. Well let me tell you, it's all because of these little babies. Do yourself, and your feet, a favor and buy these. You'll never regret it!!!