I have been a volunteer at an aviation museum for 2-1/2 years. In order to support the weight of the aircraft, the concrete floor is about 4 feet thick. I also walk over to a major university football tailgate party and spend most of the day on my feet in an asphalt parking lot. For a while now (at least the 2-1/2 years I have been at the museum) I have been searching for a combination of insole and shoe to be comfortable during and after those events. I walk that concrete floor in the museum for 4 hours at a time. I used to wear a combination of insoles, but my bad back, and hips would always be stiff and my ankles would swell after a shift. Since I started using Protalus insoles, I am not nearly as stiff and sore as I was before. Nothing is ever going to heal my back, but using these insoles has made participating in the things I enjoy so much easier on my lower joints. Extremely happy I found this product and will definitely recommend it to friends.