If you have recent previous pairs of Cole Haan's, you need to purchase the same size. If you don't have any previous Cole Haan's, then you'll likely need to go down 1 to 1.5 sizes. My Nike sneakers have the same Lunaron sole (identical), but my Nike's are size 11. If you put both shoes up to each other, they are the exact size length. So go figure on how companies determine their shoe sizes.