Definitely work better for wider feet. When I would try to push it down, the curve would just move over. I’ve emailed to either send the rest of the parts or issue me a full refund. Awesome sound from Hi Res source. Now, bone conduction isnt quite an entirely novel idea or invention. 🤬I was hopeful it worked, if you have sensitive skin this sauna suit isnt the product for you. 5 shoe and I got the 9-10 narrow. A second is provided (along with a couple of wrenches and hex key), so there is that. But I liked other things about it so purchased it in a medium. Easy to install, too.