Modern consumer products, textiles, footwear, and other multi‑material goods are engineered for performance, cost, and speed to market, not quality or material recovery. As a result, the vast majority of textile-based post‑consumer products are landfilled or incinerated due to complex mixtures of polymers, fibers, additives, coatings, adhesives, dyes, metals, and foams that defy conventional recycling systems. These challenges reduce post-use marketability and are increasingly becoming unique to the textile product category and are shared across sectors (apparel, automotive, home goods, etc.) that rely on complex material assemblies.

This symposium brings together chemists, engineers, designers, waste managers, policymakers, and industry stakeholders to collectively explore how circularity might be enabled for complex post‑consumer materials by building effective ecosystems.

Rather than presenting finished solutions, the session is intentionally interactive, creating space for participants to work together to unpack the fundamental differences between current material systems where contamination, material degradation, legacy design choices, and incompatible chemistries are inherent constraints and new impact-designed systems that can accurately handle post‑consumer textile waste streams.

Through facilitated discussion and systems‑level “world building,” participants will examine where chemistry, engineering, policy, and infrastructure currently fall short and where collaboration could realistically move the needle. The symposium will explore shared challenges and tradeoffs across sectors, including:

• Chemistry‑driven recovery approaches (e.g., solvent systems, depolymerization, enzymatic and selective separation) and why disentangling complex material mixtures remains difficult in practice.
• Engineered recycling systems for heterogeneous post‑consumer streams, including the limitations of mechanical, chemical, and hybrid approaches at scale.
• Infrastructure and ecosystem design, spanning collection, sorting, preprocessing, and pathways for recovered materials to re‑enter value chains. 
• Policy and market enablers and tensions, such as extended producer responsibility (EPR), producer responsibility organizations (PROs), and the unintended consequences of emerging regulations.
• Workforce and industry transitions, exploring how manufacturing, recycling, and materials innovation may need to evolve together to support circular systems.

By emphasizing dialogue, shared problem‑solving, and cross‑sector learning, this symposium aims to build a common understanding of the constraints shaping circularity for complex materials and to identify critical gaps, open questions, and opportunities for collaboration. While rooted in textiles and footwear, the discussion will generate transferable insights for other sectors facing similar challenges, including automotive interiors, consumer electronics, and composite products, where material complexity remains the primary barrier to a circular materials economy.