Ok, something weird happened this morning. I expected snow/rain so I didn't put on my regular windbreaker but a more rainproof jacket. Merino wool sweater as base layer and dress shirt above it as always. Once I got to work the sleeves of my dress shirt were moist at the top of my arms (not under the arms). So I guess what happened was the merino wool did what it was supposed to do, transfer all the moisture up, through a dress shirt and it hit the inner side of my rain jacket, where it stopped and didn't transfer the moisture out but returned it back to my dress shirt. No big deal, but at first I had no idea what happened. (and it wasn't snow or rain, because there wasn't any after all).

You live and learn, I guess.