A wearable medical device includes a water-resistant harness, and a plurality of ECG sensing electrodes and a plurality of therapy electrodes disposed on the harness. The plurality of therapy electrodes are configured to provide at least one defibrillating biphasic shock. The device includes a control unit comprised within a waterproof case. The control unit is configured to monitor ECG information of the patient based on a sensed ECG signal, and responsive to detection of a cardiac arrhythmia, provide the at least one defibrillating biphasic shock. The device includes a water-resistant or waterproof connection pod configured to electrically couple to the plurality of ECG sensing electrodes, the plurality of therapy electrodes, and the control unit, and to provide the sensed ECG signal from the plurality of ECG sensing electrodes to the control unit and the at least one defibrillating biphasic shock from the control unit to the plurality of therapy electrodes.
