Warm, Very Slim
These Polartec pants are very soft and warm, but be aware that they are quite slim-fitting. Typically I would be an XS (5 ft, 100 lb), but I had to order a size M so that they would not be too tight in the waist. A small would've probably fit, but I imagine it would be slightly uncomfortable. The length is a bit too long because of this, but the tapered leg ensures that the bottoms stay up and don't get stepped on. Bottom line: a great mid-weight bottom, just be sure to order a size up or more.