Warm jacket will warm you. Created for cold and wet weather. You can wear it under clothes, or standalone.
Underwear suits include jacket and trousers. They created to provide additional comfort during cold weather. They expels moisture from the body and you can use them during physical exercises
Different Russian Socks. Here you can find as summer socks, as winter wool socks.
Here you can find Underwear bundles. They include weekly or montly stock of different underwear. It's very useful, when you are out of home and cannot wash your clothes regulary.