I was hoping for a miracle when I ordered the Model T inserts, and it worked. Several months ago I was refitted for running shoes. They said I needed stability shoes when I've always been in neutral shoes. I switched to the stability shoes and slowly began to wear them. The result was severe pain in both my feet and peroneal tendinitis in my right foot. Within several days of using the Protalus inserts, the pain and tightness started to disappear. It's not completely gone yet, but my runs are almost pain-free. Now I'll be able to train for and run Big Sur in April next year. I'm sold on this insert. Thank you.