GooseFeet Waterproof Shell
This shell will allow you to use your Down Socks around camp and for those midnight calls of nature. They have a Dyneema X sole, along with a gray silnylon upper with a shockcord drawstring at the top to seal out rain, snow, and the cold. They will also have a removable closed-cell foam insole for extra foot protection when walking around camp.
If you would like for these to be completely waterproof, you will need to seam seal these yourself.