Acavallo Collier Martingale CalfskinAcavallo collier martingale in calfskin. Practical and adjustable. The martingale with collier in soft calfskin is an essential accessory to improve your horse's attitude during riding. This harness limits excessive lifting of the horse's head, helping to maintain a more controlled and regular position. Furthermore, it always directs and keeps the reins in position thanks to its fork. Made with high quality calfskin, this martingale is as durable as