I wouldn't purchase this if you are looking for breathable, warm leggings. In my experience, the leggings have a very thin fleece lined, I wasn't even able to tell it had anything until I actually turned it inside out to see it and feel it. I wore the leggings with a fleece lined jean and the leggings did not help me at all to feel warmer. They are also hard to put on if you are on the chubby side and up. Also, after a few hours they start feeling pretty tight in the toe area (I don't know why because apparently there is space but that's what I felt, my shoe size is 9US for reference). They overall would be fine to work out but for daily use or really cold weathers like 40°F or so no. I will keep looking for those perfect fleece lined leggings that keep me pretty warm throughout the coldest days.