Body and universal electrodes can sometimes be difficult to position on the skin, depending on the part of the body. They are quite large and become even heavier when wet.
In addition to the sewn-on straps on body electrodes, it can help to secure the electrode with cling film. The film presses the electrode evenly against the skin and prevents it from losing fluid during treatment.
Another advantage: the wet electrode is covered, preventing any chill from evaporation. Furthermore, you can wear clothes over it without them getting wet. This makes the application much more comfortable.