I know that these have been around for a while, but I had never tried them because I previously thought they were a bit too simplistic and tacky. I guess I learned not to judge a book by it's cover.
http://maplegrovebarefootguy.blogspot.com/2011/04/invisible-shoe-custom-huarche-review.html
http://maplegrovebarefootguy.blogspot.com/2011/04/invisible-shoe-custom-huarche-review.html