Originally Posted by Aimz
In my exeranice the pad only slips if something is off with the saddle. Usually the gullet it too narrow so the movement of the shoulders 'push' the pad back under the saddle.
Unless the hills you are ridding are very steep in that case if your saddle fits really well try a breast plate or play around with thicker/thiner pads
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I would also like to add that if the saddle is not tightened enough it will cause problems...too many riders think they are doing the horse a favor by Riding a loose cinch. If the cinch is too loose, not only can the pad slip, but also can cause rubbing of the pad on the back causing a sore back.