I am really happy I purchased these. These kept me plenty warm underneath an additional pair of pants on the cold and windy volcano of MaunaKea. They are thick enough that they can be worn alone like fleece lined leggings, which is precisely how I intend on wearing them now. I have thicker legs and often have a problem with some leggings being too restrictive, not these, they are perfect and comfortable. I even slept in them one night.