A girth, sometimes called a cinch (Western riding), is a piece of equipment used to keep the saddle in place on a horse or other animal. It passes under the barrel of the equine, usually attached to the saddle on both sides by two or three leather straps called billets. Girths are used on Australian and English saddles, while western saddles and many pack saddles have a cinch, which is fastened to the saddle by a single wide leather strap on each side, called a latigo.
Although a girth is often enough to keep a well-fitting saddle in place, other pieces of equipment are also used in jumping or speed sports such as polo, eventing, show jumping, and fox hunting; or on rough terrain such as trail riding. These include breastplates, overgirths, cruppers, and, on pack saddles, breeching.
Studies have shown that, although girths may restrict the movement of the ribcage in the horse, they have no effect on the horse's ability to take in air.
Several types of girth are shaped to allow ample room for the elbows. The Balding style is a flat piece of leather cut into three strips which are crossed and folded in the center, and the Atherstone style is a shaped piece of baghide with a roughly 1.5” wide strip of stronger leather running along the center. A variation on this is the overlay girth, in which the piece of leather in the center is the same curved shape as the girth. This overlay is often stitched in a decorative design.
Unshaped girths are commonly made of flat, heavy cotton, or padded cotton with nylon webbing reinforcement, or out of leather as in the tri-fold or threefold girth, popular among sidesaddle riders and traditional foxhunters.
Fleece girth covers are often used on sensitive horses to protect the barrel of the horse, and some styles of girth come with attached or removable sheepskin liners that perform the same function.