No that's not right. We have some Bartl saddle cloths, some just normal & others that are lined with sheepskin, you use them the same as any other. I have no idea where your friend got that idea......kind of strange?
I ordered it off eBay. it's the one with the sheepskin wither pad.
I just thought I'd check, sounded silly when she said it, but I've never seen one before and with my pregnancy brain and mis-reading stuff can never be too sure haha .