Wither wideners for western saddle

I have a TB with high, narrow withers. He's mostly an english horse, but I'd love to be able to ride him western too sometimes. His english saddle fits him great, but my western saddle is too big at the withers (I had it before I had him) and I'd like to purchase something to make it fit him well enough to ride him in it from time to time. I know it would be better to have a saddle that already fit him, but that's not an option. If there's no way to fix it I will have to sadly accept that I can't ride him western at all
So I was looking at Pro-Craft Wider Withers, and they come in both fleece and felt. I was thinking fleece might be better but I'm not sure.
Does anyone have any opinions on this product or any suggestions for something they like better, or anything at all? I hate to buy without being sure first.

Thank you

I don't really know anything about that stuff...
But I figure that fleece would be more durable than felt in the long run.

The fleece has felt inside, so it's a little thicker than the plain felt. Either one would be fine.

If he has tall withers though, I would look in to a built up cut back pad. That will give his withers room, but add extra padding to lift the saddle up off his shoulders and withers.