# Compostable Sole Sneakers Stella McCartney and Balena Updated the S-Wave Sport Sneaker Style By Laura McQuarrie | Published 2025-07-08 | Fashion Source: Trend Hunter, https://www.trendhunter.com/trends/swave-sport References: [vegconomist](https://vegconomist.com/non-food/shoes/stella-mccartney-partners-balena-sustainable-sneakers-compostable-soles/)  Material science company Balena teamed up with [Stella McCartney](https://www.trendhunter.com/trends/taekwondo-shoes) to launch a new version of the S-Wave Sport sneakers featuring [BioCir Flex soles](https://www.trendhunter.com/trends/norda-001a), a material that biodegrades into renewable biomass when composted in industrial facilities. Balena’s BioCir Flex material is made from castor beans, oils, and polysaccharides and dyed with natural cinnamon. Performance-wise, this material is said to be as durable as TPU and as flexible as rubber. While the white version of these shoes uses Piñayarn paneling, which incorporates pineapple leaf fibers sourced from agricultural waste, the wine version has uppers crafted from an engineered [recycled polyester knit](https://www.trendhunter.com/trends/allbirds-remix) as an alternative to virgin fossil fuel-based fibers. The new sneakers are now available as part of Stella McCartney’s Autumn 2025 collection. ## Trend Insights (Trend Hunter) - Score: 6.5/10 - Popularity: 78% | Activity: 74% | Freshness: 44% - Audience gender: 30% men, 70% women - Primary generations: Millennial, Gen X - Top markets: North America ## Categories [Trend Hunter](https://www.trendhunter.com/trends) > [Fashion](https://www.trendhunter.com/fashion) > [Shoes](https://www.trendhunter.com/shoes) ## Key Themes ### Key Themes Behind This Trend - **Biodegradable Footwear Materials:** The use of biodegrading soles like BioCir Flex presents an innovative solution for creating eco-friendly footwear that reduces landfill waste. - **Agricultural Waste Repurposing:** Utilizing pineapple leaf fibers from agricultural waste in shoe designs showcases a creative approach to sustainable materials in fashion. - **Natural Dye Innovations:** Incorporating natural dyes like cinnamon offers a sustainable alternative to synthetic dyes, reducing environmental impact in the textile industry. ### Where This Applies - **Sustainable Fashion:** The shift towards compostable and recycled materials in footwear marks a significant move in sustainable fashion innovation. - **Material Science:** Developments in advanced biodegradable materials like BioCir Flex signal transformative opportunities for material science in various applications. - **Waste Management:** Repurposing agricultural waste into fashion products demonstrates a promising intersection of waste management and creative industry applications. ## Related on Trend Hunter - [Sustainable Running Shoe Designs](https://www.trendhunter.com/trends/supernatural-runner.md) - [Sustainable Single-Piece Sneakers](https://www.trendhunter.com/trends/on-cloudboom-strike-ls.md) - [Textile-to-Textile Recycled Sneakers](https://www.trendhunter.com/trends/allbirds-remix.md) - [Plastic-Free Compostable Sportswear](https://www.trendhunter.com/trends/organic-athletic.md) - [Plant-Based Footwear Outsoles](https://www.trendhunter.com/trends/natural-rubber-outsoles.md) - [Mushroom-Based Sneaker Boxes](https://www.trendhunter.com/trends/mr-bailey-x-adidas-originals-ozlucent.md) - [Banana-Made Luxury Sneakers](https://www.trendhunter.com/trends/balenciaga-4.md) - [Living Footwear Concepts](https://www.trendhunter.com/trends/jessica-thies-synthiesis.md) - [Bio-Circular Trail Shoes](https://www.trendhunter.com/trends/norda-001a.md)