Material Advisor
Thomas Eberhard
The Leather’s Secrets
A specialist in exceptional leathers and fine materials, Thomas Eberhard has been advising OSZI for more than three years, guiding the House on leather selection, quality standards, artisanal excellence, and the protection of our craftsmanship. We asked him to share the essential principles that define exceptional leather and explain how an OSZI creation is designed to age beautifully over time.
Understanding Full-Grain Leather
What is full-grain leather, and why is it considered the finest expression of leather craftsmanship?
A hide is like a tree: it is made up of several layers. The grain is its bark, its outer surface. It is the part that has lived, carrying texture, marks, and history.
Full-grain leather is leather whose surface is left intact, without being corrected to erase its natural characteristics. The hide is preserved as nature created it. In doing so, we honor the uniqueness of each animal and the beauty of the material itself.
This is also what makes full-grain leather so demanding. Corrected, sanded, or heavily finished leather naturally conceals many imperfections. Full-grain leather hides nothing. Every detail remains visible. This means that the animal, the farming conditions, the season, and the preservation of the raw hide must all be selected with absolute rigor.
It is a choice of authenticity rather than convenience. That is why full-grain leather is found in the finest leather goods: pieces created to age gracefully alongside their owner.
Why OSZI Works Differently
How does the House’s approach differ from that of most luxury brands?
Many luxury houses think primarily in terms of volume. They must produce collections, manage inventory, and ensure perfect consistency so that every piece looks exactly like the catalog photograph. It is an industrial logic, even when dressed in the language of craftsmanship.
OSZI has made the opposite choice. We begin with the hide itself, and then with the person for whom the piece is intended.
This approach is rooted in bespoke tradition and in the founder’s great-grandfather’s heritage, where leather is not a material to be standardized, but one to be understood and respected. We embrace the character of each hide instead of trying to smooth it away.
Such a philosophy requires more time, constant collaboration with tanneries and artisans, and unwavering attention to detail. It is what gives every OSZI creation its own identity, shaped by the meeting between the leather’s inherent character and that of its future owner.
Selecting the Finest Leathers
How does OSZI select its leathers?
Everything begins in the field. Leather is not chosen from a catalog; it is selected hide by hide, by hand, often directly at the tannery.
We examine the grain, suppleness, fiber density, surface consistency, as well as the leather’s touch, scent, and thickness.
A hide worthy of becoming an OSZI creation is one that has been responsibly raised and expertly tanned, with a fine, even grain and no structural weakness that could compromise the piece in ten or twenty years. We do not limit ourselves to any particular origin or country, provided that every stage meets the highest standards of animal welfare, nutrition, care, and environment. And that each step of the manufacturing process reflects our pursuit of excellence.
We always think about the finished object and its longevity, never only about its appearance on the day it is delivered. It is much like choosing a great wine: you judge not only the label, but also its aging potential.
Full-grain leather is a living material. Like wood, it continues to evolve long after it leaves the workshop.
The Beauty of a Living Material
How does full-grain leather evolve over time?
Exposure to light, air, and the warmth of the hands gradually develops a patina. Its colors become richer, its surface softens, and it gains depth and character.
Unlike corrected leather, whose finish may eventually wear away or crack, full-grain leather becomes more beautiful with time.
It is the opposite of wear. An OSZI creation carried for ten years tells a unique story: that of its owner, and eventually of those who will inherit it.
Preserving an OSZI Creation
What are the essential recommendations for caring for an OSZI piece?
Full-grain leather requires very little maintenance, but the care it receives should be appropriate.
Its three greatest enemies are excessive humidity, intense heat, and prolonged direct sunlight, all of which can dull or distort the material.
It should also be protected from ink, perfume, cosmetics, and oils, which can permanently stain such an absorbent natural material.
When the piece is not being used, it is best stored in its protective pouch, in a dry, temperate environment away from direct light.
Finally, in the event of uncertainty, accidental damage, or the need for restoration, the best course of action is to contact the OSZI team so that we can determine the most appropriate solution for your creation.
The Role of the Workshop
Why should an OSZI creation always be entrusted to the House’s workshop?
An OSZI creation is not a standardized object. It was designed, cut, and assembled specifically for that particular hide and its unique characteristics.
Only the House’s artisans who created it truly understand its construction, stitching, reinforcements, and the way each element was assembled.
An external repair may fail to respect this architecture, whether through stitching, recoloring, or restoration that does not follow the patina the piece has developed over the years.
At OSZI, every stage of craftsmanship is conceived, considered, and executed with patience, reflecting our philosophy of excellence. We believe that a creation is built like a marathon, never in haste.
The OSZI workshop knows how to restore a piece to its original integrity while honoring the story it has built with its owner. It is this continuity between creation and care that allows an OSZI piece to be passed down through generations while preserving its beauty, authenticity, and integrity.
For any question of uncertainty, accidental damage, or restoration, the House remains at your care.
Contact the Workshop ← Back to OSZI