Wool is a completely natural and biodegradable fiber. Since it is composed mainly of keratin, the same protein found in human hair, at the end of its life cycle it naturally decomposes in the soil, without releasing microplastics or persistent substances into the environment. Under suitable conditions, wool can biodegrade in a few years, returning nutrients such as nitrogen and sulfur to the soil. It is a renewable raw material that grows on the animal every year and, once discarded, returns to the earth, completing a virtuous cycle. This characteristic clearly distinguishes it from synthetic fibers and strengthens its value in a contemporary context increasingly attentive to environmental impact.