Side reins with an elastic rubber ring to provide a softer feel for the horse's mouth. The elastic ring creates a small expansion zone, allowing the horse to find a place in front. The side reins are of the correct length when the horse's nose is in a vertical position, or shortly before, as it extends its nose to the level of the shoulder joint. In addition to the side reins, the horse's neck movement is also restricted laterally. These training aids offer the advantage of providing the horse with lateral flexion and making it less easy for it to evade (avoiding throat flexion) or reject (shifting in the jaw).