Not sure on sizing, my feet keep getting wider and wider and that can be a problem with many shoes I own or have owned. The only problem is my sons feet are wide. I personally hate having to break shoes in before they are comfortable, so I really appreciated that this was not necessary with these sandals. I had a pair just like these many years ago and loved them. He read it and now is a full time streamer and on a pro team. You have to buy that separately and it is about $35-$45 depending on where you look. ?? I put these up in the heavily trafficked entryway of our home over two months ago and theyre still holding strong! Will update in a few weeks (if I remember to) as far as durability goes. Didnt feel like the hassle of returning so I gave them to him and went back to tevas. It has a pin going through it that prevents it from rotating due to torque, which if you think about it is great when youre working on your bike.