its for girls in puberty who are about to get their period...where their boobs haven't totally grown out yet...but your mom or older sister or aunt teaches you how to wear your first bra...which is like a sports bra you see women wear at the gym...its designed just for young girls who haven't developed full breasts yet...so that eventually as they do grow you get used to wearing it and are ready to wear the real thing...to support your breasts and form some shape...you don't want those ...