The us of TAPERED foam shims (of just the right resilience and density) is essential for the success of our saddle system. As a matter of fact: 20 years of research has indicated clearly that utilizing our tapered foam shoulder shims properly would improve your horse's comfort under any saddle system. Please be certain you know how far back your horse's shoulder blade swings in full stride. The front of the shim should be positioned at that spot (inside your saddle pads shim pocket or on top of your pad underneath your saddle).