Never worn shoes for running too binding and uncomfortable, wanted to run off trail where there are catus and have been looking for a barefoot design to allow me to be protected. I have tried so many other styles for barefoot running and they have all failed for being too stiff on my foot not allowing unrestricted movement for running and too much pressure from the stiff form on the top of my foot and ankle..  I chose this design for the grove in the upper sole to allow for front foot running.  Works perfectly for comfortable flexible front foot running . Very lite, non restrictive and very comfortable on my foot no pressure points as the other styles, could wear with or without socks. I got the 9.5 M have an adverage width foot  fits really well in the width, I do have a little more room  above the big toe  (+ or - 1/2 inch of space)  of the shoe then I would normally find in purchaseing 9.5 M  guess it's because this design has a more pointed end type design,  Can't say now if that  extra space will bother me or not running longer distances as the width fits like a soft glove I don't see the shoe slipping during movement on a short distance trying them out.  I hate anything that will cause a pressure point on my foot, so the extra space at the toe gives my toes freedom and most likely be a good thing for me.  So 4 starts if the space is an issue for anyone else.  I love them the instant I put them on feeling the difference from all the other styles I have tried.  All I needed was the sole protection without losing the barefoot freedom and these do just that..