The human body must release a certain amount of calories produced by the metabolism, when the environment has lower temperatures than comfort, the heat that comes out of our body is higher than it should, which produces a cold sensation. To avoid heat loss we use jackets, gloves, hat, etc., in order to increase the thermal resistance and decrease the heat transfer to the environment, the measure of this thermal resistance is measured in clo.
clo = 0.155m ^ 2K / W
