The first thing you should consider when looking for winter shoes is the fit. Feet swell in cold weather and can get wet, so make sure your boots are comfortable and flexible. If they're too tight, it's more likely that you'll get blisters or chafing on your skin.
It is also important to note that waterproofing is just as crucial for winter shoes. If you live somewhere where it rains a lot, or if snow gets slushy and muddy, having waterproof shoes will make your life so much easier. Plus, the best waterproof winter shoes are more expensive than regular ones—but they last longer and are more comfortable too!