I originally bought these for "living room" rather than "warmth" but I can confirm that in wintry conditions (between 15 and 25° F when I wear them) create an excellent warming layer under ordinary jeans or other pants that don't warm themselves. The thick drawstring waist means I don't have to use laces on a day to day basis, which is nice if you're feeling extra "rested" on a particular day. I wouldn't buy these as a substitute for long johns as they are cut like pants and are therefore roomier than real long johns, but they can be used as a pad if you have slightly baggy pants to pull over (ie jeans or pants with a loose fit). I would say that I am completely satisfied so far.
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