Leather Quality
Good leather starts with the grain — the tight outer surface of the hide. Full-grain leather keeps it intact, so it breathes, creases naturally, and takes polish well for years. Corrected-grain leather is sanded and coated to hide flaws, which can look flawless on day one and crack later.
Finishing, thickness, and the right material for the job matter just as much. A supple calfskin suits a dress shoe; a heavier, oiled leather suits a work boot. Quality is not one thing — it is the right leather, properly finished, for the way you'll wear it.