Crocs in general, for my wife, are hard to find the right size and fit.  The Unisex shoes seem to be more tailored to men then they are women.  I've purchase several Unisex shoes with no problem.  My wife always seems to have a problem.  We have tried purchasing in her actual shoe size for women and that seems to work.  Her words -- ugly, but feel great.  Not sure I could run in them to chase after the kids.  Hopefully this helps!