I started out with heel pain. But once they did an ultrasound, they found that I had a 4 mm tear in my plantar fascia tendon. I needed to wear a foot boot on my right foot for almost 7 weeks. After going online and realizing that this foot boot was uncomfortable and also my other foot was taking the brunt of the weight from me being in a foot boot, I decided to research orthotics and came across Protalus! Not only did I need an arch support in my foot boot but then I also needed an arch support for my other foot which was bearing the weight of my entire body. These inserts saved my life! I got the T100. And now after being out of my foot boot, finally, I still wear them continuously and my plantar fasciitis has diminished.. Thank you Protalus!