Everyone should experience walking in fresh, cold snow in down booties once in their lives. Hard to describe this wonderful feeling.
We always bring down booties camping in the winter, they are our second pair of shoes.
Friends once made fun of my booties, so I took them to a wood-heated log cabin in the dead of winter (upstate NY) for a weekend. By the end they were fighting over my one pair.
For just warmth, not walking around in, we sometimes bring down socks.