This is the 4th season that we're buying rocket boots for our family. Great boot. My kindergartener can get them on and off by herself. The liner comes out so I can measure their feet and also dry the liner. These and a pair of Smartwool socks keep 'em toasty on almost any adventure we drag them on. They do run on the smaller side. I usually go up an size to a size and a half just so they last longer. With a gym shoe that might be a problem, but with these, the kids don't seem to mind.