Leather collier martingaleMartingale with leather collier, that limits the movements of the horse's head upwards. Leather martingale with the aim of preventing the upward movement of the horse's head by acting directly on the mouth by means of the reins passing through the ring placed at the end of the fork. The reins must be used with stoppers, otherwise the martingale can slide forward and get caught on the bit ring, blocking the horse's head and risking to make it fall.