A heater system (301) includes a bag (303) forming a cavity, a fluid bladder (401) carried within the cavity and forming a fluidly sealed chamber (305). The fluid bladder (401) being configured to store electrorheological fluid within a fluidly sealed chamber (305). The heater system (301) further including an electrical wire (307) in fluid communication with the electrorheological fluid and a heater blanket (403) carried within the cavity. The method includes altering the electrorheological fluid with a current and providing heat with a heater blanket (403).
