5 regular or 9 wide in Clarks shoes. How annoying! I didnt give it 5 stars because I didnt expect the hiss/static I got when I hooked the mic up to the church sound system. However, if you have narrow feet your feet will slip towards the front of the shoe. Works if you twist the cable just right, so its definitely the cable. Bring the included pair with you so you can match the width. t didn’t last two months. " now no one can visually identify my only weakness in public. Very sensitive, I had to lower my sensitivity a bit, which honestly seems like a good thing. I was so excited to get these but they ended up being too tight for my wide feet.