However, protective equipment is taken seriously and then shoes stay on. Here in Sweden, of course ordinarily all shoes are taken off (for 8-9 months of every year they're wet and dirty) but if workers come in to do some work, they keep their shoes on because they're protective equipment. If you're having them come during a particularly dirty time of the year, you may want to cover your floor with newspapers or give them shoe covers.

When I worked in Helsinki, it was quite common to see people do this in the office as well. Some people that were otherwise appropriately dressed (business casual) would be walking around on slippers. Always thought that was slightly funny. Very practical though. I had some rugged hiking boots that I wore in the winter there that definitely would come off when I got to work.

Yeah! Same for finland, the baltic states, or poland, or russia, or any country really where there is any kind of serious winter happening.