The default hide for a leather jacket is cow. It is thick, tough, and familiar. We chose differently, and it is a deliberate choice rather than a cost-saving one.
What sheep leather does well
Sheep leather — often called lambskin — has a fine, tight grain and a naturally supple hand. It is lighter than cowhide of the same coverage, so a jacket sits closer to the body and moves with you instead of standing away from you. It drapes rather than stiffly holds a shape. Worn against a shirt or a knit, the difference is immediate.
Keeping it full-grain means we don't sand that fine surface flat. The grain stays, the suppleness stays, and the leather is free to soften further and develop a quiet patina over time.
The honest trade-off
Sheep leather is not cowhide, and we won't pretend it is. It is softer and lighter, which also means it is less abrasion-resistant than a heavy steerhide built for a motorcycle. If you want armour, buy armour. If you want a leather jacket to live in — to wear over years, not to crash-test — suppleness and weight matter more than brute toughness, and this is where sheep leather is at its best.
We think that is the more useful kind of durability: a jacket comfortable enough that you actually reach for it, made of a grade that rewards the wear.