Are siberian winter boots resistant to water ? (Valenki) Hello !

I wanted to make myself some winter boots for bushcraft so I got inspiration from Siberia. Mongols used what we call Valenki shoes made of felted wool. I have the opportunity to buy some fabric and then sew it in order to craft myself some Valenki but I was wondering if it was resistant to all kind of soil like the forest one, humid and wet one, etc.

Thanks bye ! :)