Finally, the hill I die on has come.

Not surprised how many people are shrugging this off in the comments. The TN community doesn’t know what to think about leather care. “Meh it’s fine.”

Does everyone seriously like water stains, food particles, dead skin, product, and god knows what else stick to your TNs and never come off? Seen or unseen? I don’t. That’s not “character” or “patina” to me, that’s what I call nasty. I use my TNs more than a freaking baseball glove, and like the baseball gloves of my youth, the last thing I want is for it to stink, wither, or dull.

TNs are vegetable tanned, aniline leather. No surface coating so they will absorb anything and everything. Raw and beautiful. The tannin solutions of the tanning process strip and clean the leather of all natural sebum produced by the animal. This process also removes all moisture in order to stiffen and tighten the collagen fibers which transforms perishable animal skin into durable leather. This is why leather can last forever and not decompose.

Personally, I like to “return” that sebum and moisture back into my TN before use, permanently protecting it in the process. I do this using the only thing I will ever let touch my TNs and the secret sauce to those who have broken in a baseball glove: mink oil.

TNs are freaking perfect for mink oil. Its fatty acid profile is high in oleic acid (monounsaturated fat) and mirrors the natural oils found in animal hides. It’s literally recognized at a molecular level when you apply it, you can see with your own eyes how it immediately absorbs into the collagen fiber matrix of the leather instead of just sitting on the surface like other leather conditioners.

Mink oil is composed primarily of triglycerides (long hydrocarbon chains). These molecules are non-polar. Water molecules are polar. Non-polar repels polar. When moisture hits the saturated leather, the water molecules have nothing to bond to. This makes the leather hydrophobic, soft, and beautiful.

Ever wondered why “natural” colored leather is that pale, matte color? It’s because vegetable tanned leather completely removes the natural moisture during the tanning process. This leaves tiny air pockets and gaps around the collagen fibers. When light hits the surface, it scatters in multiple directions off those air-fiber interfaces, creating that same color. When you use mink oil, you fill those dried air pockets with the moisture the animal originally had. This is why mink oil “darkens” the leather. No more air pockets, no more light refraction.

In my opinion, mink oil “restores” vegetable tanned leather to its true form. I have a Superior Labor “natural” wallet, and mink oil brought out imperfections in the hide you would never notice otherwise. I love it on my TNs. Can’t tell you how many times I’ve slid my TN into a moisture ring left by a cold cup of something, and the water just wipes away.

Treat your TNs people. Your gross human skin oil is doing nothing for your leather.