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