This is what I have been using: https://www.amazon.com/gp/product/B017PIUNS8/ref=oh_aui_detailpage_o09_s00?ie=UTF8&psc=1 keep in mind that I normally wear a size 13 in most brands, but with Clarks I wear a 12, and the thinness of this insole adds the right amount of comfort (for me) without adding bulk, so paired even with medium thickness socks they feel perfect. Your mileage may vary, of course.