The MacBook sleeve is made of high-quality Italian leather that is tanned entirely without chemical additives - in true traditional craftsmanship, just like over a hundred years ago.
Good quality, easy to clean, and plastic free. Better than other plastic-free alternative's like wool and leather which tend to have more tracking issues.
The quality and the type of leather are very nice. Perhaps a little unstable in handling and an opening for the charging cable would be nice.
Very good quality, looks great!