Closing the loop on sneakers

In the United States, more than 300 million pairs of shoes are discarded each year, the vast majority ending up in landfills.

Footwear recycling historically has lagged behind other waste streams due to the complex, multimaterial construction of shoes—rubber, EVA, PU, TPU, textiles, foams and adhesives all tightly bonded together. But growing regulatory pressure and brand sustainability commitments are pushing the sector toward scalable industrial solutions.

While reuse remains the preferred option for wearable shoes, a significant percentage of collected footwear ultimately reaches the end of its useful life. Additionally, brands increasingly are seeking solutions for unsold inventory, production overruns and defective stock that cannot enter the secondary market. Together, these streams represent a substantial and largely untapped material recovery opportunity.

One of the most promising developments in the sector combines mechanical preprocessing with advanced optical sorting. In a pioneering facility in Florida, shoe soles are mechancially separated from uppers and shredded into controlled granule sizes suitable for sensor-based identification.

Once reduced to uniform flakes, the material can be processed using high-precision optical sorting systems capable of distinguishing polymer types.

Picvisa, a European leader in artificial intelligence- (AI-) driven sorting for postconsumer materials, has adapted its technology to address this challenge. The company’s ECOFLAKE system uses advanced vision and material recognition algorithms to identify and separate complex polymer blends commonly found in footwear soles, including rubber, EVA, PU, TPU and PE. The result is high-purity output streams, with polymer separation levels exceeding 95 percent.

Such purity is critical if recovered materials are to reenter manufacturing processes rather than being downcycled. Clean, separated polymers can be reincorporated into new footwear components and other molded products, helping close the loop in a segment long considered too complex for true recycling.

Picvisa’s experience in postconsumer textile sorting, where systems are already installed in multiple industrial plants across Europe, has provided the foundation for tackling footwear waste. As extended producer responsibility policies expand and circularity targets tighten, industrial-scale polymer separation may become a cornerstone of the emerging footwear recycling market.

What was once viewed as an inseparable waste stream is increasingly being recognized as a recoverable resource, provided the right technology is in place.