5, I would order that. Comunque la distanza dei fori è 34 cm. " Not really. Love the strap on the back for added support. The first time I used it, Im not going to lie, it felt really strange, and I began to feel pressure building in my ear. I turned the shoe over and was able to see the styrofoam that they forgot to cover. 5 US and they fit me perfectly. The tray also has a dovetail cutout so that two can snap and fit to each other, so as I accumulate more bits (I also have 1/2" bits and a similar tray that snaps to this one already), I can easily add more bits in an organized fashion. I found that when switching from Hip-Hop to Metal, the earbuds struggled to keep up. These sandals look great!