We also retail the Tradition Birkenstock Insole which we have had excellent results with in treating PF. We have a website set up at http://www.shoetree.com where we describe the problem and how the insoles help. If anyone has any questions, feel free to call me; I've worked with problems of the feet for over 10 years and PF is very common. Our # is 1 800 881 6686 and you can ask for me personally.
We are also an Authorized Birkenstock Repair Shop. If your sandals are worn on the corners of the heels, need full soles or replacement cork we can repair them to their original condition.