Leather is graded by which layer of the hide it comes from and how much its surface has been altered. Full-grain keeps the natural surface and is the strongest; top-grain is sanded and refinished; "genuine leather" is usually a lower-grade layer, and bonded leather is shredded scraps glued together. Tanning, mostly chrome or vegetable, then decides how the leather feels and ages.
Key facts
- Full-grain leather keeps the hide's outer surface, its strongest layer.
- "Genuine leather" is a marketing label, not a quality grade.
- Most of the world's leather is chrome tanned; vegetable tanning is a small, premium share.
- LWG certification audits a tannery's environmental practices.
The layers of a hide
A hide is thick, so tanneries split it into layers. The top layer carries the grain, the tight outer surface with natural pores and markings. It is the densest and strongest part. Lower layers are looser and weaker.
The four grades
| Grade | What it is | How it wears | On a strap |
|---|---|---|---|
| Full-grain | Top layer with the natural surface left intact | Strongest; develops a patina; shows natural marks | The best choice for long life |
| Top-grain | Top layer, but sanded and refinished to hide marks | Uniform look; durable; ages less | Common on good mid-range straps |
| "Genuine leather" | Usually a lower split layer, often embossed and coated | Weaker; coating can crack and peel | Common on cheap straps |
| Bonded | Leather scraps ground up and glued to a backing | Weak; peels and frays quickly | Avoid |
Suede and nubuck are finishes, not grades. Suede is brushed from the inner side of the leather, giving a soft nap. Nubuck is the grain side lightly sanded, giving a finer velvet feel.
Why "genuine leather" misleads
It sounds like a guarantee. In practice it only means the product contains real leather, and it is usually used when the better grades aren't. If a strap's material is described only as "genuine leather", assume it is a lower grade.
Tanning: chrome vs vegetable
Tanning turns raw hide into stable leather that won't rot. The two main methods give very different straps.
| Chrome tanning | Vegetable tanning | |
|---|---|---|
| How | Chromium salts, in hours to days | Tannins from bark, wood and leaves, over weeks |
| Share of world leather | About three-quarters or more | A small share, roughly 10–15% |
| Feel | Soft, supple from day one | Firmer at first, softens with wear |
| Water | More water- and heat-resistant | More sensitive to water |
| Ageing | Holds its colour | Darkens and develops a rich patina |
| Smell | Neutral | Warm, natural leather smell |
Many modern leathers are combination tanned: chrome first for softness, then a vegetable re-tan for character.
What LWG certification means
The Leather Working Group (LWG) audits tanneries on environmental performance: water and energy use, chemical management, effluent treatment and traceability. Tanneries are rated Gold, Silver, Bronze or Audited. It's a sign the leather was made responsibly, not a grade of the leather itself.
Still wondering?
Is full-grain or top-grain better for a watch strap?
Full-grain lasts longer and ages better. Top-grain looks more uniform. Both are good; avoid "genuine" and bonded.
Is vegetable-tanned leather better?
It ages more beautifully but needs more care around water. Chrome-tanned leather is more practical day to day.
What is Italian leather?
Leather tanned in Italy, a country with a long tanning tradition, including the vegetable-tanning workshops of Tuscany. It describes origin, not grade.
Is suede real leather?
Yes. Suede is real leather with a brushed surface.
Is vegan leather leather?
No. It is a synthetic or plant-based material made to look like leather.
Sources: Leather Naturally, Different Types of Tanning factsheet (Mar 2026) · Première Vision, A focus on tanning methods
Keep reading: The leather strap, how it's made · A good strap, how to spot one · Strap care, material by material
