Keep the rain off and keep the cold out. If you're wondering why your feet are cold then it's because sometimes a pair of cotton socks just isn't enough. Overshoes can serve two purposes - keep the cold out and keep the rain out. In the middle of winter a good set of overshoes will make the difference to a comfortable ride and a few hours of torture. Another benefit of overshoes is they keep your shoes clean and help extend their life.