FWIW, I use an Alaskan Sheepskin Buttpad on top of an Airhawk for my long trips. I have had my Alaskan Buttpad since 2006 and it is still doing just what it is supposed to do.
I picked one up when I was in Anchorage. I've done a lot of miles on the stock seat with that seat pad, including two 1000+ mile days. I recently got a Seat Concepts seat, haven't moved the sheepskin cover over to it yet but I likely will.
I have an Alaska sheepskin but never found that it made much difference on the Tenere and other big bikes that I tried it on. Nothing beats a good seat. I do use one on my XT250 for lack of a better alternative.