If you need larger sizes they are useless. One review suggests buying a larger size and then cut back. I have neuropathy and very sensitive feet. The foam and surface are perfect but because they are too narrow and they don't make a wider size I struggle to get them in the right place and keep them from moving. I bought several sets and tried to glue them in the best spot but they are too narrow to work at all. I wear medium sise width shoes but Spenco doesn't make a product to fit . Spenco doesn't have a web site that I could find so they are clearly not interested in feedback. USELESS