>>11130982Think about each fiber as a conductor of heat. Individually the fiber would be negligible as he would move around it through the air. But the fibers densely packed allow for retardation of heat conductivity. Therefore it wouldn't matter which direction the fuzzy part was facing. As collectively they would retard the change in temperature if there is a temperature difference between one side than the other. Ergo putting this on your head helps keep heat in while keeping cold air out.
If we didn't sweat it would probably be a good idea to keep a hat on to insulate from higher temperatures. some cultures do wear loose-fitting Garb to allow for sweat to work while insulating from Heat with fabric.
sweat acts as a heat conductor to help keep the head cool as it evaporates .
