At first maybe this will look like a joke to you, however you need to know that this is a very popular practice in Germany, and now it is spreading all over the world. And this is one of the best prevention measures of colds and various different illnesses.
Many people that have tried this method claim that wet socks have the ability to narrow the blood vessels in the feet and this leads to a redistribution of the blood to the parts that fight against the flu.
This is one of ways to fight the cold, your body will warm up in order to maintain the homeostasis. And the greater the flow of the blood is, the smaller are the chances of you getting sick. This is the main goal of this idea, try it out, you have nothing to lose, you will only improve your health.