Encourage your horse to learn self-carriage with the Horze De Gogue Aid Horse Reins. Made of leather and rounded nylon cord, these training horse reins fasten to the extended breast strap with clips from 3 points; the poll, neck and mouth to form a triangle. The horse reins are designed to encourage the horse to use his muscles correctly for proper self-carriage. They are useful for flatwork training in a variety of disciplines.