The Posture Vest masterly consists of three surfaces that force acts on. The three forces formed from shoulders to back, and they make people's body have the feeling of being supported and give spine a force of being pushed forward. A force of pulling backward also formed on both shoulders at the some time, just as both hands slightly move the shoulders backward. These two forces of pushing and pulling remind you all the time to uplift your chest and head, to keep a upright standing posture. As time goes on, good habits will gradually be cultivated while the poor habits of crookback and humpback will be overcame.