I love the look of this shoe and they are very sexy on but man do they hurt.  The ball of the foot part isn't the issue, its the strap.  I was looking at it in more detail and the strap part is not sewn on centered.  The strap part is off to the left so that why it is rubbing on my ankle which caused blisters.  I live and work in nyc and walk around all day.  The balls of my feet didn't hurt at the end of the day.  Now its the next day and my feet hurt are sore.  I am going to soak them in an epsom salt bath tonight.  I used band aids on my ankles and that fixed the issue.  Super cute but be cautious of ankle strap pain.  Break out the band aids.