I picked the wrong day to wear this.  The weather got up to 50 degrees the day I picked to wear these.  It was in the 20s a couple of days before, but I really didn't need them.  Anyway I figured I should wear them since I have them.  So I wore them under some jeans and I was warm, but after a 45 train ride into NY city I could feel it getting warmer and warmer.  By the time I got of the train and checked into my hotel, I had to take them off because they were too warm.  I really should have worn them the day before when I was walking around in 30 below weather.  Anyways they worked, I was warm and toasty in cold weather.