This Neck or Wither Strap is used to give your breast collar a proper fit. It will hold your breast collar up in the correct position over the shoulders. If you have a sagging breast collar it will restrict the shoulder movement, make it uncomfortable for a horse to stride out and cost you valuable time. This Neck Strap connects to the dees on your breast collar and lays over the withers, holding up the breast collar in the correct position.