I make sheats from the best quality cow leather.
Usually normal puukko sheat includes wooden insert, which protect the user and sheat itself from the sharp blade. Leather is hand stiched around the insert when the leather is wet and then slightly wet formed. I dye all my leather myself, so it comes natural color from the factory.
I like to keep leather maintenance as simple as possible, so end customer can maintain it easily in the future. I use mainly just leather grease. Sometimes wax finish.