Y-Girthing System is a flexible system which enables a better girth fit for various horse shapes.  Girths will not always be done up on the same hole in a Y-Girthing system where horses are larger up front or behind.  The key with the system is to ensure consistent pressure on both straps, not doing up on the same hole.  It is possible to over tighten the back strap of the Y-System which can impact the saddle fit and lead to back pain.