A device for cooling the skin tissue of a patient during a procedure using energy includes a mat-like structure, the mat-like structure having a bottom wall, a top wall and upstanding walls connecting the top wall and the bottom wall, the walls defining an enclosed volume； it also includes one or more electrodes positioned to protrude from the bottom wall and extend through the volume for connection to a source of energy； further, the volume defines a space for holding a cooling substance for cooling the one or more electrodes and the skin tissue during an energy- based procedure.
