"Sustainable sourcing" gets used as a catch-all term, but for footwear specifically it usually breaks down into three measurable commitments: material traceability back to the tannery or mill, reduced water and energy use in wet processes, and verified labor conditions across every tier of production, not just the final assembly line.
Brands making real progress here tend to start small — auditing one material category or one factory tier at a time — rather than attempting a full supply chain overhaul in one step. That incremental approach is also easier to verify, which matters increasingly to retail partners asking for documentation, not just marketing claims.