I have these merino wool leggings that I use as is or under other pants when temps dip and I'm going to be out walking, etc for any length of time.  They are warm, fit well, are soft enough and so cozy to sleep in as well. I followed instructions on washing and drying and am very pleased with the results.  A bit on the expensive side, but I could not find anything cheaper that offered the warmth of these.  I have really lived in them over the winter, so I feel they did turn out to be a good deal!