Let me be clear, in my opinion under armor, although feeling cold by itself, is the  best under a windbreaker or a coat. I work outside all year, for 15 years, 10-12 hrs a day. under armor sox are the best. I camped last year May 10TH IN THE SNOW FOR 5 DAYS ON FLOUR and stayed warm and dry except for the SPECIAL EXPORT that was cold and wet. ;)