today i went and tried the brand new white/red vapors and i found that i wear a size US 8 but i have the older original white vapors and i wear a 8.5. i am interested in getting the mist blue vapors but once i buy them i can't return it. they are a newer model than my size 8.5 whites, but older than the size 8 white/red. what size do u think would fit? in other words, do they run longer like the brand new ones?

i wear 11 1/2 vapors (by the way i HATE them a lot) and i have a size 12 foot.