So far, so good.  I've only worn them for one entire day for about 10 hours to break in.  They were super comfortable.  My feet never did sweat and I felt very sure footed.  I'm 64 and I'm a little more cautious than I used to be when wearing sandals.  These allowed me to not worry about sliding out of my shoe and tripping.  I have a small foot (US 5.5).  These fit perfectly.  My wide stubby short toes never got hung up between the straps which sometimes happens.  I plan to wear these throughout Italy in the next few weeks!