I haven't worn them out in the cold yet, but I wanted to review the fit since that was something I was worried about.

I'm 5'6", ~160lb, 30/40/30. I got the medium and they fit PERFECTLY. They have the high waist I wanted - and not too lose or tight - and they're long enough to stretch over my heels if I wanted. I always worry about the hips/waist because I have more butt than usual for my size, but these leggings are wonderful. The sleeves are a little looser than the rest of the torso, but that doesn't bother me.

The only thing that stands out to me as vaguely negative is that I can feel the inseam as my thighs brush, but honestly I think I'll tune it out quickly once I wear them for real.

They are wonderfully stretchy and warm. The outside feels like a jersey knit and the inside feels like flannel - ever so soft. I'll be recommending these to my mother!