I normally wear a size 7.5W shoe, but I have large calves.  Having read the reviews, I was worried the calf shaft wouldn't fit if I ordered true to size.  Much to my surprise, I had a little extra room in the calf and in the shoe box.  They were still comfortable, but if I ordered again, I would go 7.5.  By the end of the day the tops of my feet were a little sore from my toes having room to move around.