As any hiker will tell you, warm, dry feet are a key to happiness. In an emergency, happy feet are essential.
Most evacuations involve some type of water whether from a fire hose, flooding, rain or other event. There's real potential your feet will get wet and wet feet could spell extreme discomfort.
The solution is simple - pack an extra pair of cosy socks in your go bag so when you get to where you're going - a shelter, a hotel, a friend's house - you can put on your dry socks and have happy, toasty toes.