I am an Ultra runner. I have problem of overpronation . So inspite of wearing shoes designed for low arch or flat feet, i used to have strain and pain on my left knee, leading to displeasure and discomfort in my long training runs. When I started using Frido Insole ( combo , Rigid for walking and semirigid for running) , I could feel that remarkable difference , it has much much reduced the strain on my left knee that used to bother me, on account of overpronation. Initially i was skeptical to ...