Best Shoe Inserts for Heels & Flats — Temporary and permanent inserts for heels

I recently had a letter from a women who had a problem with being unable to find the correct high heel shoes (or ballet flats) that would properly fit her narrow foot, especially at the heel. She had also been unsuccessful in finding the correct shoe inserts to place into her shoes to make them more wearable and comfortable. This is a common problem because many commonly available shoes come only in medium width. There are also issues with some shoe manufacturers who use the same shoe last for womens' and mens' shoes, adjusting only for size and not overall...