Full-grain leather keeps the natural surface of the hide, which makes it the strongest and longest-lasting grade. It shows natural marks and develops a patina over the years.
Top-grain is sanded to remove imperfections, so it looks more uniform but is slightly less durable. “Genuine leather” is a lower grade made from the leftover layers of the hide and is not built to last.
What to look for
Check the label, look at the grain, and ask what hide the jacket is made from. A good maker will always tell you.