When I first tried these winter gloves, I thought, "No way, they are too thin for our Midwest winter." They fit well and felt very nice on the hand, but I just did not think they would be warm enough. Then I learned that the gloves were named "Thinsulate, " and despite being thin they were thermal insulated with microfiber that was supposed to trap more air and keep the warmth. I was very curious to see how this technology would perform. Well, after wearing them in downtown Chicago where that biting cold wind gets under the warmest clothes, I can say that these gloves are good! In fact, they may be the warmest I've ever worn. At some point, my hands felt hot, not just warm in them. So if you think good winter gloves have to be bulky, try 3M Thinsulate; you will be surprised.