Your horse will change shape as its maturity, type of work and level of fitness changes. The EASY-CHANGE Gullet System allows you to alter the width of you saddle to custom fit the shape of your horses wither. There are six fractional-fit gullet widths available in the standard EASY-CHANGE Gullet System and four ultra-wide widths available in the EASY-CHANGE Gullet System WIDE ( the only system accredited for use in Bates and Wintec WIDE models).