These are awesome boots!  I debated ordering due to size concerns.  However, like another reviewer posted, order 1 size down from your Nike size.  I did that and they fit perfectly.  Wore them to work on a casual Friday with jeans for my first wearing.  Had them on for over 10 hours and they were comfortable even though they weren't broken in yet.  I will buy at least 1 more pair in black.  Buy these and you will be happy, they are well worth the money!