A plant-based sneaker with a compostable sole has just stepped into the global spotlight. The Stella McCartney S-Wave Sport Sneaker, featuring Balena’s proprietary BioCir® Flex, has been named by TIME magazine as one of the Best Inventions of 2025 for TIME100 Climate 2025. This recognition places Balena at the forefront of material innovation, demonstrating that circular materials can deliver both high performance and high desirability on a global scale.
“An estimated 22 billion shoes are sent to landfill every year—but Stella McCartney’s new S-Wave Sport Sneaker is one step toward a more responsible future,” wrote TIME’s Jenna Igneri. “Each shoe is vegan and features a pineapple leaf yarn-knit upper, but its biggest breakthrough lies in its sole, which is crafted from BioCir Flex, a non-toxic material made by Balena.”
For Stella McCartney, sustainability has long been a defining principle. “Every part of it incorporates conscious materials,” McCartney explained. Engineered from biodegradable polymers and plant-based components, BioCir® Flex is as durable as polyurethane and as flexible as rubber. “It can be recycled or composted—leaving no waste or negative impact on Mother Earth,” she added.
The fully compostable, recyclable, and bio-based BioCir® Flex represents a shared commitment between Balena and Stella McCartney to create planet-conscious products without compromise. The S-Wave Sport Sneaker signifies a defining moment in the evolution of circular fashion, proving that sustainability and luxury can move in lockstep.
“This collaboration with Stella McCartney marks a milestone not just for Balena, but for the future of materials,” said David Roubach, Founder and CEO of Balena. “Being featured in TIME’s Best Inventions showcases the global momentum behind circular innovation and validates the work we’re doing to redefine what’s possible with next-generation materials.”
As Balena continues to expand its portfolio of high-performance, circular materials, the company remains focused on transforming industries from footwear and fashion to accessories and beyond—shaping a future where innovation and environmental responsibility walk side by side.
