Ergonomic Massaging Gel Insole contain a non-toxic, precisely measured liquid that flows through a patented control system. Because of the unique design of Liqua Care, whether you are walking or standing, a series of channels filled with a highly viscous liquid causes the muscles in your feet to move imperceptibly which in turn makes the blood circulate, thus improving venous pump function. A patented liquid control system ensures directional stability during walking and enables an anatomically correct rolling motion of the feet.