Why does my leather seat look shiny, and is that a good sign?

Most modern automotive leather has a factory matte or satin finish. A shiny seat usually means body oils, dirt and product residue have built up, or that the protective topcoat is wearing smooth. Cleaning with a dedicated leather cleaner often restores the original matte look. Shine is not a sign of well-conditioned leather. If the seat stays shiny after cleaning, the topcoat may be worn on high-contact areas such as bolsters, and those areas need gentle cleaning and protection to slow further wear.