USG nylon side reins can be used during lunging or riding to help your horse maintain the correct posture. A side rein is used to teach the horse to yield and thus find balance in the lateral bending of its body. It also helps to work towards a higher, horizontal, or lower stance. The side reins are easily and widely adjustable using the snap hook and numerous rings. The special rein clips are user-friendly and safe to use and find the correct position automatically. The side reins can be attached to the lunging girth, cavesson, girth, saddle, and bit rings. Packaged in pairs.