Where can I get those , I would love one !
I got mine from staying with a friends Sami relatives a few years ago.
Reindeer hides are usually sold untreated or silicone treated. The untreated ones are raw hide on the side that lays on the ground. They can absorb water if not used in really cold (sub zero) or dry conditions.
Silicone treated ones have the raw hide surface treated with a silicone waterproofing. They are not 100% waterproof, but do limit how damp the skins get. If not stored correctly, when new, the silicone surfaces stick together and are difficult to separate. (With use the silicone picks up dust and dirt and stops the silicone being sticky)
In the photo, If it’s not subzero, I use them on an old ‘safari’ camp bed to keep them clean and dry.