The present disclosure provides a hydrogel electrode designed to be integrated within a wearable functional electrode stimulation (FES) system. The wearable FES system comprises a portable electrical stimulator; wearable and stretchable clothing; an electrical connection between the electrical stimulator and the wearable and stretchable clothing; means to carry a current within the clothing; and one or more hydrogel electrode(s) which interface between the clothing and an applicable body part.