Its was a smallish local german producer iirc and its sheeps wool based. I can check later tho, maybe they have an online shop.

Found it, buts its a german only site that only ships to a few european countries. https://www.dormabell.de/produkte/kopfkissen_dormabell-active

I got the 40x80cm “nature” version which is merino wool, but they also got fiber and down versions with the same concept. Im sure there are other companies with similar products.