I have a Fjallraven coat that has a lot of down, plus their waxed G1000 material. It's not something I'd take on an expedition, but it's fine for being outdoor

I have a Fjallraven coat that has a lot of down, plus their waxed G1000 material. It's not something I'd take on an expedition, but it's fine for being outdoors below zero. You don't need the waterproof/breathable stuff quite so much at those temperatures because it's just snow. I was out and about with the coat for several hours in -20C weather here this past winter and it did fine.