Wool has accompanied humanity for millennia. A warm, breathable, biodegradable fiber, it fascinates by its complexity and by the way it connects the animal, the landscape, and human craftsmanship. Behind a simple wool sweater or coat lies a remarkable chain, which begins on the back of a sheep and ends in the finesse of a knit or a fabric. Understanding wool means diving into a story of terroirs, techniques, ethics, and environmental challenges.