Permission Few discomforts are more annoying and potentially dangerous than being cold. Moisture is lost through the sweat glands. When the moisture is turned to vapor, heat is extracted from the body. When clothing becomes wet from perspiration or other sources, it becomes less insulative, allowing the body to cool. Wool and some synthetics insulate better than other fabrics when wet, but no clothing is really warm when it is wet.
Conduction occurs when heat is transferred directly through a medium.
This type of heat loss is minimal with a reasonable amount of clothing. The blood vessels in the outer areas of the body constrict in the cold to keep heat in the more vital areas and slow conductive heat loss. An exception to this is in the head. You should always keep your head and neck well covered. Convective heat loss occurs when heated air rises and is replaced be cold air.