Lower Back Exoskeletons assist the lower back through a variety of different technology choices. Among the main distinctions include whether they are powered by an external power source, or passive (incl. pneumatic and soft exo types). In simple terms, passive devices are purely mechanical structures, which may be cheaper and lighter in weight. Powered exoskeletons on the other hand, are robotics devices, which can generally provide a higher level of assistance, and even enhancement.