A lab-grown fungi jacket developed by Vollebak demonstrates that cultivated mycelium—the root-like network of fungi—can outperform traditional leather in high-performance outerwear design. This one-off Mycelium Jacket is not a commercial product, but rather a material experiment and design object that challenges how Patagonia, Arc’teryx, and other technical outerwear brands should think about sourcing their core materials.
Key Takeaways
- Vollebak’s Mycelium Jacket uses lab-cultivated fungal structures as a direct alternative to animal leather.
- The design adapts classic A-2 flight jacket proportions to mycelium’s structural properties, favoring fewer seams and smoother curves.
- Raw, matte surface preserves natural fiber patterns rather than imitating processed leather.
- Material scalability remains a challenge due to slow growth rates and inconsistent output.
- Vollebak also develops DNA-engineered colors from genetically modified microorganisms, eliminating synthetic dyes.
Why fungi beats leather for jacket design
Mycelium performs better than animal leather precisely because it does not need to be processed like leather does. Traditional leather requires heavy tanning, coating, and finishing to achieve durability and water resistance. The Mycelium Jacket abandons this logic. Instead, the design works with mycelium’s natural behavior—favoring fewer seams, smoother curves, and a raw surface that preserves the material’s organic growth patterns. This is not an attempt to fake leather; it is a deliberate architectural choice that treats mycelium as its own material with its own strengths.
The pocket design exemplifies this philosophy. Two large side-entry double-layered pockets, a zipped internal pocket, and a snap-fastening outer pocket with moleskin bags sit flat against the body without the bulk that traditional leather construction demands. The reduced seam count means fewer failure points and less manufacturing complexity—a direct advantage over conventional jackets.
The scaling problem that matters
The critical limitation is growth speed and consistency. Mycelium takes time to cultivate, and output varies batch to batch, making industrial scaling extraordinarily difficult. This prototype uses only a small number of carefully grown sheets without heavy coatings or composites to bridge the material’s natural limitations. Vollebak has not solved the production problem yet. What they have done is prove the concept works at a prototype scale, which is precisely the kind of signal that major outerwear manufacturers need to justify investment in biofabrication infrastructure.
Patagonia and Arc’teryx have both invested in material innovation—recycled synthetics, plant-based alternatives, and circular design—but neither has yet committed to programmable biomaterials like mycelium on a commercial scale. Vollebak’s experiment suggests the path forward is not incremental improvement of existing materials, but fundamental rethinking of how garments are grown rather than sewn.
Vollebak’s broader biomaterial vision
The Mycelium Jacket is one piece of a larger material technology strategy. Vollebak also develops DNA-engineered clothing in collaboration with Cambridge scientists Orr Yarkoni and Jim Ajioka, using genetically engineered microorganisms to produce lab-grown colors instead of synthetic dyes. This approach eliminates the chemical waste and toxicity of traditional dyeing. The company’s other experimental jackets—the Full Metal Jacket (copper and silver editions with virus-killing and electromagnetic properties) and the Thermal Cloaking Jacket (two-layer thermal and electromagnetic shielding)—show a consistent philosophy: materials are programmable systems, not fixed resources,.
The display case for the Mycelium Jacket itself was 3D-printed using polylactic acid (PLA), a biodegradable bioplastic derived from corn starch, and designed with organic patterns inspired by fungal growth. Even the presentation reinforces the message: biofabrication and digital production belong together in the future of design.
What this means for the outerwear industry
A one-off concept piece from a small experimental brand does not disrupt a $100 billion outerwear industry overnight. But it does something equally important: it proves the technical feasibility of a radical alternative and forces established brands to acknowledge that leather—whether animal or synthetic—may not be the default material forever. Mycelium grows faster than cattle, requires no tanning chemicals, and degrades naturally at end of life. The only barrier is manufacturing scale.
The fact that Vollebak chose to reference the A-2 flight jacket—one of the most iconic garment silhouettes in history—is deliberate. It is not saying mycelium is a niche material for experimental fashion. It is saying mycelium can handle the same design language, the same durability expectations, and the same cultural weight as the most proven outerwear ever made.
Is the Mycelium Jacket available for purchase?
No. The Mycelium Jacket is a one-off design object and material experiment, not a commercial product,. Vollebak has not announced pricing, availability, or production timelines. It exists to demonstrate possibility, not to be sold.
How does mycelium compare to synthetic leather alternatives?
Synthetic leather (polyurethane, PVC) requires petroleum-based chemistry and does not biodegrade. Mycelium is grown from living organisms and breaks down naturally at end of life. The trade-off is speed: synthetic leather can be mass-produced in weeks; mycelium takes months to cultivate. But mycelium requires no toxic tanning or coating processes, making it cleaner to produce at scale once manufacturing systems are built.
Could Patagonia or Arc’teryx adopt mycelium jackets?
Technically yes, but only if they invest in cultivating mycelium supply chains and solve the scaling problem that Vollebak has identified. Both brands have the capital and distribution to make it happen. What they lack is the urgency—their current materials still sell. Vollebak’s prototype is a shot across the bow: the technology works, the concept is proven, and the first major brand to commit to biofabricated outerwear will own a significant competitive advantage in sustainability and material innovation.
Vollebak’s Mycelium Jacket is not the future of outerwear—not yet. But it is the clearest signal yet that the future will not look like the past. Fungi-based materials are no longer theoretical. They are grown, worn, and photographed. The question is no longer whether mycelium can replace leather, but whether the industry will move fast enough to make it happen before a smaller, more ambitious brand does it first.
This article was written with AI assistance and editorially reviewed.
Source: T3
