The closest I’ve found over the years is the Werner Christ Horsedream. Curious to hear what else you’ve tried?
Yes, I’ve tried Horsedream as well. Also very nice pads.
As an addendum to my sheepskin pad care, I also put some Eucalan in the rinse cycle to help preserve the leather and wool.
I have a Mattess and some less expensive Fleeceworks and Cavalier sheepskin half pads. All picked up excellent as new second hand. They all do the job. The Mattes is the biggest and is dressage cut, and the last one I bought. The others are AP cut. The Mattes is definitely the best quality but they all do the job and have held up fine to washing in Melp and being next to the horse.
I think Horsedream is similar quality, however their sizing runs on the small side and they have very limited colors.
Fleeceworks didn’t hold up for me.