These are very warm leg warmers.  I was a little skeptical at first but now I wear them when ever I venture outside in the cold for more than 2 hours.  I use them on my calf and they keep my legs very warm, I do a lot of outdoor wildlife photography in the winter and warmth is something I need in upper New York where the temperature can bite at 10 degrees and below.  I would purchase them again, they are made very well wash nicely and didn't shrink.