Tough1 Ultimate Foundation Shim Pad This pad is constructed of comfortable moisture wicking cotton. Six shim pockets are strategically located giving you the ability to correct a variety of saddle fitting issues by removing 1/2" felt shim pads that are included. The Ultimate Foundation saddle pad can be used under a saddle blanket or as a stand-alone pad. Specifications: Size: 31" x 32" Shims: 1/2" thick