 Usually this style is called a "running rein," though the term "draw rein" is also sometimes used.Some styles attach directly to a regular snaffle rein, which limits the degree of force applied, while others slide freely and with little limit to the leverage that can be applied.Another style, also called a "draw rein," runs from the rider's hands, through the bit ring (outside to inside), over the poll, through the other bit ring, and back to the rider's hands, without attaching to the girth.