I have a terrible back and left foot that sustained fractures from a motorcycle accident. I will tell you; my Protalus inserts are very helpful...The best thing I have ever purchased for my shoes. I wear them over my orthotics in my New Balance shoes. I was able to notice an improvement in my stance, balance, and endurance immediately. I am 72 years old, and walking is no longer an excruciating experience. Thank you!