I really wish they came in half sizes.  The 10 was just perfect at first, but as we know, they stretch.  I am fairly sure that if I had gotten a 9 the front seam would be under my toenails and very uncomfortable.  Otherwise they are the most comfortable mocs I have ever had and have been wearing multiple brands for 35 years now.  Will buy again when I need to replace them, but really wish I could get the right size.