100% virgin wool fleece contacts horse for superior feel and comfort. Thick orthopedic fleece center absorbs shock and disperses pressure. Closed-cell foam shim is wedge-shaped to alleviate saddle fit issues. Contoured to fit the horse's shape more closely. Alleviates saddle fit due to atrophy or conformation issues at the withers. Adjustable correction; slide forward for less, slide back for more.