I ordered two colors of this shoe.  They both fit exactly the same - unfortunately, they were both too large in length and a bit too wide.  According to the shoe departments, I'm in between a 12 regular and a 12W.  Since most women's shoes run a bit narrow, I found that "generally" a 12W fits the best.  These shoes felt at least a full size too large and would flap off my heel which made them impossible to wear.  The problem with the size really surprised me considering that other reviews stated that this shoe ran small and was narrow - apparently not the case for larger sizes.  The inside of the shoe felt like a cloud, very comfortable and I really wish they would have fit better.  I tried to look for alternate sizes however the price increased by 4X the original price I paid so I'll have to wait awhile to see if there is a price drop.