An electrode apparatus for delivering TTFields, configured for affixation to a patient's skin, the apparatus comprising: a flex circuit having a trunk region (108; 108a-g) that extends in a longitudinal direction and a plurality of branches (106a-e; 106a-d) that extend laterally from the trunk region (108; 108a-g), each of the branches (106a-e; 106a-d) having a free distal end and a proximal end that is connected to the trunk region (108; 108a-g), with a plurality of the branches (106a-e; 106a-d) extending on at least one lateral side of the trunk region (108; 108a-g), and the flex circuit having an inner, skin-facing side and an outer side; a plurality of electrode elements disposed on the inner side of the flex circuit along the branches (106a-e; 106a-d) of the flex circuit, each of the electrode elements having a conductive plate that is connected to the flex circuit in an electrically-conducting manner, and a dielectric layer positioned to face the skin of the patient; a foam layer disposed on the inner side of the flex circuit, wherein the foam layer is configured to cover at least a portion of the trunk region (108; 108a-g) of the flex circuit and at least a portion of the branches (106a-e; 106a-d) of the flex circuit and leave the electrode elements uncovered; a skin-level adhesive layer disposed on a skin-facing side of the foam layer; and a top, covering layer disposed on the outer side of the flex circuit, the covering layer being sized to cover the branches (106a-e; 106a-d) of the flex circuit and overlap spaces between the branches (106a-e; 106a-d) of the flex circuit, the covering layer having adhesive on a skin-facing side thereof; characterized in that: the adhesive on the skin-facing side of the covering layer provides means by which the covering layer can be adhered to the patient's skin through the spaces between the branches (106a-e; 106a-d) of the flex circuit. a flex circuit having a trunk region (108; 108a-g) that extends in a longitudinal direction and a plurality of branches (106a-e; 106a-d) that extend laterally from the trunk region (108; 108a-g), each of the branches (106a-e; 106a-d) having a free distal end and a proximal end that is connected to the trunk region (108; 108a-g), with a plurality of the branches (106a-e; 106a-d) extending on at least one lateral side of the trunk region (108; 108a-g), and the flex circuit having an inner, skin-facing side and an outer side; a plurality of electrode elements disposed on the inner side of the flex circuit along the branches (106a-e; 106a-d) of the flex circuit, each of the electrode elements having a conductive plate that is connected to the flex circuit in an electrically-conducting manner, and a dielectric layer positioned to face the skin of the patient; a foam layer disposed on the inner side of the flex circuit, wherein the foam layer is configured to cover at least a portion of the trunk region (108; 108a-g) of the flex circuit and at least a portion of the branches (106a-e; 106a-d) of the flex circuit and leave the electrode elements uncovered; a skin-level adhesive layer disposed on a skin-facing side of the foam layer; and a top, covering layer disposed on the outer side of the flex circuit, the covering layer being sized to cover the branches (106a-e; 106a-d) of the flex circuit and overlap spaces between the branches (106a-e; 106a-d) of the flex circuit, the covering layer having adhesive on a skin-facing side thereof; characterized in that: the adhesive on the skin-facing side of the covering layer provides means by which the covering layer can be adhered to the patient's skin through the spaces between the branches (106a-e; 106a-d) of the flex circuit.