100% wool felt, Canadian made with North American felt. Best quality in wool felt pads. 1/4 wool felt pad with 3 pockets for shims when needed for correcting saddle fit. Great to use for horses with high and narrow withers, or curved backs, narrow spines, which can cause the saddle to bridge. Shims can be removed as needed. Wool felt has the best qualities to conform to your horses back, wick moisture away, breathe and not block air flow. Pad is either shaped or can be rectangle for western saddles.