Unique microfiber or fine fibers that act as the thinnest insulation by trapping air molecules between you and the outside. The more air traps a substance in a given space, the better it makes you better than the cold air outside. The fibers in Thinsulate insulation are often better than fibers used in other synthetic or natural insulation because they trap more air in less space which naturally makes Thinsulate insulation a better insulator. Therefore, 3M has not repealed the laws of nature with thin insulation. They make it easy for them to keep you warm.
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