The mandibular advancement device (MAD) for fin set is disclosed, which includes: a shell, and there is a wall to define a hollow inside, and wall surrounds hollow inside and removing one, and it is open at one end to leave ontology The thickness range of the wall is about 1 nanometer to about 5 millimeters The hollow MAD including about the same size and fin. It also discloses MADs, such as uses sleeve. It also discloses that treatment MADs patient uses, such as uses sleeve.