It might look like a prosthetic limb or a cybernetic leg, but these "boots", if you can still call them that, are something perfectly normal and capable people can use. What for, you ask? Well nothing more than to actually conserve energy. Humans have evolved to walk on two legs, that much is true. But that doesn't mean we've already reached the most efficient, energy-saving way to walk. That is what this exoskeleton pair are trying to accomplish, trying to reduce that amount of energy you expend while walking.