It can be easily fitted to the horse and adjusted around the shoulder  and girth in order to achieve an ideal fit. The neck straps on this  martingale are joined with leather forming what is known as a ‘bib’,  this helps keep the riders reins together and also stops the horse  reaching back and grabbing the neck straps.
Why use a bib martingale?
A bib martingale works in the same way as a classic  running martingale. The addition of a bib keeps the reins closer  together and also prevents the horse from getting the neck straps in its  mouth. It can be used to help prevent a horse from raising its head  above a point where it can be controlled. When the horse raises its head  too high the martingale applies leverage through the reins to the bit,  encouraging the horses head downwards.