Stella McCartney S-Wave trainer campaign image

Stella McCartney Partners with Balena’s BioCir®Flex once again on the S—Wave Sport Trainer FALL 2026 collection
Now Available to Purchase

Stella McCartney Autumn 2025 S-Wave footwear top view

BioCir®Flex is a next-generation material that combines high-performance capabilities with environmental responsibility

Compostable & Recyclable

Compostable & Recyclable

Designed for circularity, BioCir®Flex biodegrades into renewable biomass when composted in industrial facilities or can be recycled for continuous use.

Bio-based Innovation

Bio-based Innovation

Made from sustainable sources like castor beans, oils, and polysaccharides, ensuring it does not compete with food resources.

Dyed Naturally

Dyed Naturally

The S-Wave Sport trainers incorporate BioCir®Flex dyed with natural cinnamon, highlighting its non-toxic properties.

Durable & Flexible

Durable & Flexible

As durable as TPU and as flexible as rubber, it absorbs impact and responds to motion, making it ideal for footwear.

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