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BOLT THREADS TECHNOLOGY

MYLO

Mycelium is the branching underground structure of mushrooms. It grows as tiny threads that form vast networks under the forest floor.

We developed Mylo from mycelium cells by engineering it to assemble into a supple yet durable material that has the potential to biodegrade and can replace real and synthetic leather.

Mylo can be produced in days versus years, a process that minimizes our environmental impact.

Mycelium is the branching underground structure of mushrooms. It grows as tiny threads that form vast networks under the forest floor.

We developed Mylo from mycelium cells by engineering it to assemble into a supple yet durable material that has the potential to biodegrade and can replace real and synthetic leather.

Mylo can be produced in days versus years, a process that minimizes our environmental impact.

The process begins with mycelium cells.
We grow the cells on beds of agricultural waste and byproducts.
Billions of cells grow and form an interconnected 3D network.
We compress the resulting network and tan and dye it to make Mylo™.

BOLT THREADS PRODUCT

FALABELLA PROTOTYPE X STELLA MCCARTNEY

In April 2018, we collaborated with designer Stella McCartney to create a prototype of her iconic Falabella bag, made with Mylo. The bag premiered at the Fashioned from Nature exhibit at the Victoria & Albert Museum in London.

In April 2018, we collaborated with designer Stella McCartney to create a prototype of her iconic Falabella bag, made with Mylo. The bag premiered at the Fashioned from Nature exhibit at the Victoria & Albert Museum in London.

BOLT THREADS PRODUCT

DRIVER BAG

This driver bag is the first commercially-available bag made with Mylo in collaboration with Chester Wallace. The bag was fully-funded through a Kickstarter campaign in October 2018. Follow our journey on Kickstarter.

This driver bag is the first commercially-available bag made with Mylo in collaboration with Chester Wallace. The bag was fully-funded through a Kickstarter campaign in October 2018. Follow our journey on Kickstarter.

Frequently Asked Questions

What is Mylo™?

Mylo™ is a material made from mycelium, the network of thread-like cells that make up mushrooms. We carefully control the mycelium’s growth conditions to produce a mycelial mat that can be cured and tanned into a soft, supple material that looks and feels like leather.

What is mycelium?

Mycelium is the network of thread-like cells that make up mushrooms. It’s made up of billions of tiny branching cells, which form a 3D micro-scale mesh structure. It holds the forest floor together and acts as nature’s recycling system by releasing enzymes that break down natural materials and release nutrients into the soil.

What are the benefits of Mylo™?

Mylo™ is remarkably leather-like, but no animals are used in making it.

Mylo™ grows in a matter of weeks, compared to animal hides which take years to grow.

Because we carefully control its environment, we can direct the mycelium’s growth and control the final material’s properties including thickness, shape, and more.

Compared to synthetic leathers which are made from polyurethane, Mylo™ feels natural and has better moisture management properties.

Mylo™ also has the ability to biodegrade.
Mylo™ has a soft, supple, warm feel.

It’s durable and abrasion-resistant.

Is this leather?

No. The term leather is reserved for animal hides, and animal hides are made of collagen. Mylo™ is made from 100% mycelium, and there is no collagen in Mylo™.

How do you make Mylo™?

We grow the cells in beds of agricultural waste and byproduct, nourishing the cells in the way that nature intended. We precisely control growth conditions like temperature and humidity to encourage the mycelium to grow upward and assemble into an organized mat of interconnected cells. We then harvest the mycelium mat and tan it with environmentally-sound dyes. Then, we compress the mat to be as thin or thick as we’d like and imprint it with a pattern, which gives us the final material.

Is this the same technology you use to make Microsilk™?

No, our Microsilk™ technology involves engineering yeast to produce silk proteins. With Mylo™, we grow mycelium, which we process into the final Mylo™ material.

Are these mycelia genetically engineered?

No, we carefully control growth conditions like temperature and humidity so our natural wild strain produces the final material with the properties desired.

How sustainable is it? Is it biodegradable?

Unlike making leather, the process of making Mylo™ doesn’t involve raising and sacrificing livestock, or any of the associated greenhouse gases or material wastes. Those impacts are substantial: Livestock uses an astonishing 30% of the earth’s entire land surface and cattle rearing generates more global warming greenhouse gases, as measured in carbon dioxide equivalent, than all transportation methods. Put simply, as disposable incomes rise around the globe, we simply can’t meet the demand for meat — and leather consumer goods — using resources available on the planet. Mylo™ is also produced in days versus years, without the material waste of using animal hides. Mylo™ is also a more sustainable option than synthetic leathers, most of which are made from polyurethane or PVC. These so-called ‘pleathers’ are manufactured using numerous toxic chemicals. While not proven to be dangerous to humans during use, these toxic chemistries persist in the landfills and groundwater. Because Mylo™ is made from organic matter, it is non-toxic and has the ability to biodegrade. We will undertake a full lifecycle analysis of Mylo™ prior to large scale commercial rollout, and we look forward to sharing those findings with the world.

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Contact Us


For press inquiries: press@boltthreads.com

For career inquiries: careers@boltthreads.com

Disclaimer: We know learning about the potential of biomaterials can inspire a wealth of ideas and we love your creativity. Before you send us your awesome ideas, please know that we don't want to accidentally come up with an idea similar to yours, so any concept you email us will become the property of Bolt Threads Inc.