This fully adjustable martingale is made of single ply 3/4 inch harness leather with a neck and safety hobble strap. Neck strap, cincha strap, and ends on ring straps are all adjustable to fit horses of all sizes. The safety hobble strap runs through the gullet of the saddle and over the horn to prevent the neckstrap from sliding to the ears. The buckles, rings and snaps are stainless steel. Leather beneath the buckles and rings has been hand sewn together to prevent slipping or turning. A favorite with professional horsemen everywhere. The martingale is a very useful tool to aid a horse in learning proper head position as he learns collection. If adjusted correctly a martingale does not force the head to stay in any given position but allows the horse a guide for head placement through automatic release of pressure on the reins when correct head placement is achieved. This can make it easier for a horse to reach a more collected frame over time by allowing assistance with head position as the rider teaches the horse to drive from behind. A good rule of thumb for adjustment is to allow horse to stand comfortably, attach snap to cinch D ring and extend ring straps until they reach the throatlatch.