take Off Your Shoes
When entering a Russian home, it is absolutely imperative to immediately remove your shoes. The host will probably provide some tapochki or slippers to wear. Streets in Russia, especially in the big cities, tend to be very dirty. For instance, if you walk around Moscow in flip flops, don’t be surprised if your feet turn black by the end of the day. Therefore, always remove your shoes. It stops the spread of dirt, snow, ice, and sand in the winter time.