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Even babies know it: wet underwear is uncomfortable. Yet precisely why this is so is a question that went unanswered by hard science until 1994, when the journal Ergonomics published "Impact of wet underwear on thermoregulatory responses and thermal comfort in the cold." The authors were Martha Kold Bakkevig of SINTEF Unimed in Trondheim, Norway and Ruth Nielson at Kongens Lyngby's Technical University of Denmark. Bakkevig and Nielson had investigated "the significance of wet underwear" by monitoring the skin and intestinal warmth, as well as weight loss, of eight adult male subjects wearing wet or dry underwear in controlled cold conditions. Apart from the obvious "significant cooling effect of wet underwear on thermoregulatory responses and thermal comfort," the research also discovered that the thickness of the underwear exerted a greater effect on these factors than the material used to make the garment. So now you know.