Kendo Vest (Do). Please Try It Before You Buy! No Refunds!! Please Leave Reviews Below And Concerns On My Page. "Osu No Seishin". Do : Torso protector (breastplate). The main component of the do is the gently curving stomach and chest protector. The modern form has a pronounced bulge to help direct the force of strikes away from the soft areas in the middle of the torso.