Abstract: A heater jacket is provided comprising an outer shell; an inner liner; batting; a waistband; two arms with cuffs; a collar; ribbing comprising flexible, elastic material at the collar, cuffs, and waistband; an inner liner; a set of heating elements; a battery compartment with metal contacts; a battery; a controls compartment; a set of controls, and means to hold the jacket shut. The conductive heating elements may comprise flexible metal elements such as those used in an electric heating blanket and conduct throughout the jacket the electricity generated by the battery. To use the heater jacket, the wearer would put a battery into the battery pocket in connection with the metal contacts, put on the jacket, and use the controls to cause the jacket to become warm to the desired degree. After use, the heating elements may be turned off and the jacket may be taken off and stored.