Disclosed is an emergency cold weather heating garment that is adapted for one-time use when rapid heating is required to prevent hypothermia and exposure. The garment comprises an article of clothing that comprises a plurality of enclosed pouches having a chemical heating agent therein. The garment is adapted to be deployed from a vacuum sealed container or wrap, and once deployed the chemical heating pouches are air-activated, initiating an exothermic reaction that gives off heat and raises the body temperature of the wearer. Each pouch comprises an air-permeable or perforated exterior surface, an interior volume of solid, air-activated heating material, and an underside surface that conducts heat across its surface. The garment is adapted to be deployed and donned above or below other clothing articles for rapidly heating the user over a period of time as the chemical heating material reacts.
