Sizing is off (once again....Altras seem to be all over the place) SIZE UP  I purchased these as a performance shoe to use in my triathlon races.  I have yet to use them as I am waiting for Amazon to send my next pair (next half size up).  I did take a couple laps around the gym and found the shoes to be comfortable and responsive.  My set back was my toes rubbing on a stitch at the very front of the shoe.  I love my Altra The One 2.0.  I have faith that with correct sizing these shoes will be great for my races.<br />I will update once I have put a few miles on my new pair coming to me.