Thinline Trim to Fit Shims are fully customizable to create the shim that best fits your needs. This cost-effective shim for English Saddle Pads allows you to create a pair of Front, Center, Rear, or Full shims to meet your needs. Made of the same shock-absorbing, comfort foam found on ThinLine saddle pads, fitting shims will never compress or deteriorate, unlike closed-cell foam and wool. The shims you buy today will last you a lifetime! In addition to creating perfect saddle fit it also protects your horses back and improves comfort for horses and riders. Shims are sold in pairs.