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Bolt Technology

MEET MYLOTM

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

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

MyloTM 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 MyloTM from mycelium cells by engineering it to assemble into a supple yet durable material that can replace real and synthetic leather.

MyloTM 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 renewable, organic matter.
Billions of cells grow and form an interconnected 3D network.
We process the resulting network and tan and dye it to make MyloTM.

Bolt 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 MyloTM. 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 MyloTM. The bag premiered at the Fashioned from Nature exhibit at the Victoria & Albert Museum in London.

Bolt Product

MYLOTM DRIVER BAG

This driver bag is the first commercially-available bag made with MyloTM 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 MyloTM 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 mycelium?

Mycelium is the network of thread-like cells that make up fungi. 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 MyloTM?
  • MyloTM is remarkably leather-like, but no animals are used in making it.
  • MyloTM 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, MyloTM feels natural and has better moisture management properties.
  • MyloTM 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 does not contain any collagen.

How do you make MyloTM?

We grow mycelium on renewable, organic matter, 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 process it with dyes and inputs that meet our preferred chemistry requirements, for example, we do not use chromium-based tanning agents. Then, we imprint it with a pattern, which gives us the final material.

Is this the same technology you use to make MicrosilkTM?

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

Are these mycelia genetically engineered?

No, we carefully control growth conditions like temperature and humidity to produce the final material.

How sustainable is it?

Unlike making leather, the process of making Mylo™ doesn’t involve raising livestock, or any of the associated greenhouse gases or material wastes. 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. By comparison, the mycelia we grow for Mylo™ is produced in days, without the resource intensity of raising livestock. In comparison to synthetic leather which is usually made from a synthetic fabric and a polyurethane or PVC coating, the foundation of Mylo™ is mycelia. We carefully select additional inputs into Mylo™ avoiding solvents like DMF (dimethylformamide) which is commonly used to produce synthetic leather. 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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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.