Leather notes are composed with naturals such as violet leaf, osmanthus, mimosa, cassie, castoreum, and birch tar, as well as synthetics such as isobutyl quinoline, synthetic castoreum, and suederal. Leather accords can be smoky and coarse or smooth and refined, and they vary from natural smelling to synthetic smelling. You might like some types of leather notes better than others, so it's worth sampling a few leathery perfumes if you are interested in the note.