Depends what I am doing in the winter. If I am just snowshoeing X amount of miles and then returning home or to a cabin then I may just wear a Capilene 1 baselayer under a regular pair of hiking or rain pants. For extended periods I will either bring my softshell pants or my Slalom bib pants.

These are all used in conjunction with either a Capilene 1 or 3 baselayer pant and if I am camping out, then my down pants are also used.