Yes, this is a special ruler for your feet. The kind you probably haven't seen since you were a little kid. Why on earth aren’t more people talking about how useful these are? They’re great when you’re trying to figure out your own size in an international size range, but this is also SUCH a help when sizing kids’ feet. My children grow like weeds and I’ve had to return an absurd amount of shoes because I hadn’t sized teeny toes correctly. This is the tool that will help you get it right and save headaches (and return shipping costs) later.