The Shires Blenheim Bib Martingale is a popular martingale with racing & breeding yards. Similar in function to a traditional running martingale, but with a solid central piece between the straps of the running martingale, the bib martingale helps to keep the reins together & prevent the horse from trying to catch teh straps in his mouth which can lead to injury & panic (common for stallions, colts & riggy horses to try & do with any flapping straps they can see!).