I read up on these shoes before purchasing.  Everywhere I read said to buy a half size up.  They were a gift so I did.  When they arrived, they were too big.  The friend looked at them online and decided she liked the black pair better.  I contacted the company who was exceptionally accommodating.  Not only did they set aside the correct size, they also let me change color.  Overall a great experience.  The shoes work great.  She says that it feels amazing to run in them!