I bought these boots to replace an old pair of Toe Warmers that finally wore out after many winters of use. The old style was no longer available. Contrary to manufacturer claims, I found that they run smaller and narrower compared to my usual shoe size, even without socks. A different style of Toe Warmers were too tight on my calves, which are not unusually fat. So I did have to try a couple of different styles and sizes to find a boot that fit. Luckily, the returns were free and not difficult to ship out. I found these boots to be warm and comfortable, and they appear to be well-made. Of course, only time will tell if this product is as durable as the older Toe Warmers were.