When thinking of thermal properties and the body, we are often told to keep the head covered from early on. The Harvard Health Publishing (2012) mentions this idea because in cold weather the blood vessels at the surface of the head don't respond much to cold and also doesn't have fat for insulation. This results in the body losing body heat can be up to a 50% loss, if the head is not covered. With the head losing heat, this affects the rest of the body even if the wearer is covered everywhere else (Harvard Health Publishing, 2012).