A girth, sometimes called a cinch, is a piece of equipment used to keep the saddle in place on a horse. It passes under the barrel of the equine, usually attached to the saddle billets on both sides. An overgirth or surcingle is often used in addition to a regular girth. Made of leather or nylon with an elastic insert (for racing), the overgirth completely encircles the horse around belly and the saddle's seat. It is used by racing to provide more security in holding the saddle in place.