It is a functional shoe developed and listed by Swiss Marseille barefoot technology company on 1996. The shoe adopts an arc sole similar to a boat shape, so that the wearer can feel a natural instability when standing and walking, stimulate the self-balance adjustment mechanism of the human body, and mobilize the muscles and bones of the whole body to participate in the balance adjustment, thus exercising the muscles, spine, joints and other aspects of the human body. Many people call MBT "swing shoes" because of its special appearance. What's more, MBT shoes are directly called "ugly shoes". In fact, MBT shoes should be called fitness shoes or healthy shoes.