This wrapper, named after where it is grown, is a reference to one of the four major growing zones in Brazil. Mata Fina is the region most prized for its wrapper leaf. The Mata Fina wrapper is almost always sun-grown. The Mata Fina wrapper, in general, has a unique earthy aroma and natural sweetness, different from the typical Maduro flavor profile, which makes sense as this is not actually from the Broadleaf variety (it’s from the Bahia).
Historically this was used as a binder istead of a wrapper. This wrapper used to be rare on premium hand-made cigars, as they are generally pretty rough looking, but is gaining popularity in recent years. Here’s a nice article on Mata Fina and Brazilian tobacco.
Examples
Danneman







