Paris Startup Ocean Recherche Turns Seaweed into Scalable Textile Materials

Ocean Recherche, the Paris materials studio led by Eugène Riconneaus, has moved a step closer to scaling seaweed-derived textiles with a family of products the company pitches as design-ready alternatives for fashion, interiors and industrial design. The firm markets SeiYarn (also referenced as SeiFibre) as a seaweed-based fiber and SeiShell as a coated canvas or leather alternative, and Ocean Recherche’s reported current production capacity is about 510,000 linear meters, with 7,000 linear meters preordered.

“I couldn’t find next-generation materials that met designers’ expectations and could scale, so I studied the science to build them,” Riconneaus said, framing the studio as a materials innovation startup working at the intersection of marine science, innovation and material development rather than a traditional textile mill. Ocean Recherche presents its work through exhibitions and collaborative design projects and has been listed among innovators on the ANDAM Innovation stage at Première Vision.

The company’s technical pitch for SeiYarn is precise: Ocean Recherche says the fiber is biodegradable, recyclable, naturally antimicrobial and dope-dyed to ensure long-lasting colorfastness without water-intensive dyeing processes. Fiber length is controlled between 3 cm and 8 cm, which the company says makes it ideal for ring spinning and air-jet spinning, while shortening the fiber allows open-end (rotor) spinning if needed. Those spinning specifications are significant for designers because ring-spun and air-jet yarns yield strong, high-quality yarns suitable for apparel and upholstery.

SeiShell is presented as a natural application of SeiYarn as a backing for a leather-like coated canvas. “SeiShell™ is crafted from seaweed and seafood waste,” reads the product description in the studio’s profile, which describes SeiShell as a coated canvas similar to a leather. That positioning targets accessories, bags and interior surfaces where a durable, coated backing is required.

Commercial cues are visible: Ocean Recherche lists partners including ClickNL, Secrid and the Dutch Postcode Lottery, and the studio’s images have been circulated under captions such as SeiShell_2 and SeiYarn_3. The company frames itself within a broader industry move toward regenerative, bio-based inputs even as the sector accelerates research: the SeaWeave initiative, reported in June 2025, aims to convert Atlantic and Mediterranean macroalgae into functional fibres and dyes, and SINTEF is slated to lead biomass selection, characterisation and processing activities.

Ocean Recherche’s claims—material performance, spinning compatibility and the 510,000-linear-meter capacity with 7,000 preorders—signal a transition from lab experiments toward commercial supply, but key verification gaps remain: independent lifecycle assessments, third-party testing of biodegradability and antimicrobial performance, and details on processing chemistry are not yet public. If the studio converts its preorders and sustains the capacity it reports, seaweed-based yardage could move from novelty into ready-to-use materials for designers.