Classic Equine cesshims-1 Saddle shims

First off, there were three in the package. Sometimes I don’t get my heavy saddle over the top of the shim and have to reach under and reposition it. But once it’s there it stays put and my rides are 4nor 5 hours at a stretch. I read some reviews that said the shims slipped out. I don’t even see how that’s possible even if the saddle is not cinched tight. I am seeing an improvement on my horses’s back.Thanks Classic Equine. Your products never have failed me.