These are super cute boots, and we love the jumping jacks brand (very comfortable and usually well made).  Unfortunately the shaft was just far too wide for my daughter, who is of average height and build (perhaps on the slim side).  She is used to more of a riding style boot, and these just flopped and gaped, so I sent them back.  As you can see in the photo it looks like the shaft widens as it goes up - that's exactly how they look in person, it's not the camera angles!