Wool, sourced from sheep, has been used for millennia as a renewable and breathable natural fibre. It is fire-resistant and fully biodegradable when untreated, with its durability supporting longer garment lifespans and circular design principles.

However, the environmental impact of wool depends heavily on farming practices. Poor grazing management can lead to land degradation, and treatments such as superwash processing or heavy chemical dyeing reduce its biodegradability. Animal welfare issues, including mulesing, tail docking, and mistreatment during shearing, persist in some supply chains.

But with responsible sourcing and careful treatment, wool can serve as a cornerstone of responsible fashion.