According to the measurements on the Size chart, my son should've fit in a 7/8 as his feet measure 6 inches. He wears a size 6 in tennis shoes, but since everyone said they run big, I decided to get the 5/6 and they fit him perfectly! They're really nice, quality sandals and will purchase again when he needs the next size. So for us, the inches on the chart were not correct but getting the size he normally wears worked out.