The elastic running martingale prevents the horse from putting its head up by indirect action on the horse's mouth through the reins. This product is less strong than the classic and raised martingales, as the elastic softens the action when the horse puts its head right up. This item is for more sensitive horses. This martingale can be adjusted with a number of holes on the chest strap. This high quality product is made of both elastic and vegetable-dyed leather.