Be the first to know about every thread

Thanks! You can also connect with us on social media

Bolt Technology

MEET MYLOTM

For billions of years, mycelium has grown beneath our feet and served as ecological connective tissue. A sprawling, infinitely renewable, interlaced web, it threads through soil, plant bodies, and along river beds to break down organic matter and provide nutrients to plants and trees. It brings sustenance to all living species and is the literal world wide web.

We developed Mylo by engineering mycelium into a material that is everything you love about leather without everything you don’t. Mylo is certified bio-based, meaning it’s made from predominantly renewable ingredients that can be found in nature. Soft, supple, and less harmful to the planet – Mylo is a sustainable alternative to leather that will become available to the world through our consortium partners.

Learn More

For billions of years, mycelium has grown beneath our feet and served as ecological connective tissue. A sprawling, infinitely renewable, interlaced web, it threads through soil, plant bodies, and along river beds to break down organic matter and provide nutrients to plants and trees. It brings sustenance to all living species and is the literal world wide web.

We developed Mylo by engineering mycelium into a material that is everything you love about leather without everything you don’t. Mylo is certified bio-based, meaning it’s made from predominantly renewable ingredients that can be found in nature. Soft, supple, and less harmful to the planet – Mylo is a sustainable alternative to leather that will become available to the world through our consortium partners.

Learn More
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 Mylo.

Deep Science Meets High Design

The Mylo Consortium

Consortium (n.) – An association of two or more entities coming together to join forces and work together in achieving a common goal.

We never planned to change the world alone. In a resource-constrained world, the time has come to develop smarter solutions through advanced science and a shared commitment to a better future. Enter the consortium – adidas, Kering, lululemon, and Stella McCartney. Selected based on mission alignment, high standards of quality, and the ability to scale worldwide, these partners banded together to invest in meaningful material innovation with Mylo.

To deliver millions of square feet of Mylo, we have built a world-class supply chain that maintains Mylo’s high quality while continuously minimizing its environmental impact. Our European tanning partner has five generations of experience working with leather and meets top certifications in sustainability, including a gold rating from the Leather Working Group. Our mycelium partner is the world’s expert in growing mushrooms; they operate a state-of-the-art facility in the Netherlands that utilizes vertical farming to minimize their ecological footprint.

We Share Really Good Chemistry

Supply Chain + Partners

To deliver millions of square feet of Mylo, we have built a world-class supply chain that maintains Mylo’s high quality while continuously minimizing its environmental impact. Our European tanning partner has five generations of experience working with leather and meets top certifications in sustainability, including a gold rating from the Leather Working Group. Our mycelium partner is the world’s expert in growing mushrooms; they operate a state-of-the-art facility in the Netherlands that utilizes vertical farming to minimize their ecological footprint.

To deliver millions of square feet of Mylo, we have built a world-class supply chain that maintains Mylo’s high quality while continuously minimizing its environmental impact. Our European tanning partner has five generations of experience working with leather and meets top certifications in sustainability, including a gold rating from the Leather Working Group. Our mycelium partner is the world’s expert in growing mushrooms; they operate a state-of-the-art facility in the Netherlands that utilizes vertical farming to minimize their ecological footprint.

Bolt Product

STAN SMITH MYLO BY ADIDAS

Debuted by consortium partner adidas in April 2021, the Stan Smith Mylo™ is the first-ever shoe made with Mylo. A limited-edition drop of Stan Smith Mylo™ will be available in the near future. By reimagining the brand’s iconic shoe silhouette with Mylo, adidas pays homage to a classic with a new pledge of responsibility to find material solutions inspired by nature. Visit mylo-unleather.com to be the first to know when the adidas Stan Smith Mylo shoe becomes available for purchase.

Debuted by consortium partner adidas in April 2021, the Stan Smith Mylo™ is the first-ever shoe made with Mylo. A limited-edition drop of Stan Smith Mylo™ will be available in the near future. By reimagining the brand’s iconic shoe silhouette with Mylo, adidas pays homage to a classic with a new pledge of responsibility to find material solutions inspired by nature. Visit mylo-unleather.com to be the first to know when the adidas Stan Smith Mylo shoe becomes available for purchase.

Bolt Product

Mylo Bustier & Trousers by Stella McCartney

In March 2021, Stella McCartney was the first to debut Mylo items from the consortium with a bustier top and trousers. The items are a peek into Stella’s design process with Mylo and an exploration of what the future will look like with sustainable materials at the forefront. Visit Mylo-Unleather.com to learn more and sign up for updates on future products available for purchase.

In March 2021, Stella McCartney was the first to debut Mylo items from the consortium with a bustier top and trousers. The items are a peek into Stella’s design process with Mylo and an exploration of what the future will look like with sustainable materials at the forefront. Visit Mylo-Unleather.com to learn more and sign up for updates on future products available for purchase.

Bolt Product

Mylo Falabella Prototype by 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 Product

MYLO DRIVER BAG

This driver bag is the prototype for the first commercially-available bag made with Mylo in collaboration with Chester Wallace. The bag was fully funded in just 7 days through a Kickstarter campaign. Follow our delivery journey on Kickstarter.

This driver bag is the prototype for the first commercially-available bag made with Mylo in collaboration with Chester Wallace. The bag was fully funded in just 7 days through a Kickstarter campaign. Follow our delivery journey on Kickstarter.

Frequently Asked Questions

What is mycelium?

Mushrooms are the fruit of mycelium, which is a sprawling, infinitely renewable, interlaced web that threads through soil, plants, and other trees. Fungi, which include mushrooms, play a critical role in breaking down organic matter to provide nutrients to nearby plants. Imagine the branches and vines that grow apples or grapes – mycelium functions like those twisting, branching supports just under the surface. It brings sustenance to all living species and is the literal world wide web.

Is this leather?

No. The term “leather” is reserved for animal hides, and animal hides are made of collagen. Mylo™ material is made from mycelium and does not contain any collagen. Learn more here.

How is Mylo™ material made?

We start by reproducing what happens under the forest floor in a controlled indoor environment. We take mycelial cells and feed them sawdust and organic material while controlling the humidity and temperature among other variables. The mycelium grows into a foamy layer — imagine a big bag of smashed marshmallows. Once the mycelium is harvested, the remaining material is composted. We then process and dye that sheet of mycelium and it becomes the Mylo material that gets used to make footwear, handbags, wallets, phone cases, and other gorgeous products.

Where do you make Mylo™ material?

Mylo material is created by Bolt Threads, a U.S. material innovations company based in California. It is grown by expert mushroom farmers in indoor vertical farming facilities and processed by scientists.

Is this the same technology you use to make MicrosilkTM?

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

Is Mylo™ material genetically modified?

No. There are no genetically engineered microbes required in manufacturing it.

How is Mylo™ material more sustainable than leather?

Given that leather has been at commercial scale for decades and Mylo material is still in small scale production, it’s too early to have an independent study on Mylo material’s environmental footprint, but creating a sustainable upgrade to leather that checks the boxes for people who love leather is the entire reason we’re doing this.

Unlike leather production, making Mylo material doesn’t involve raising livestock. As disposable incomes rise around the globe, so will the demand for meat and leather goods. This demand can’t be met using the land and water it takes to raise cattle. We need smarter, more sustainable solutions.

The mycelium we grow for Mylo material is produced in days, unlike the resource-intense process of raising livestock, which can take years.

Our preliminary impact assessment indicates the incredible environmental benefits of mycelium-based leather. In 2022, we’ll share the results of an independent life cycle assessment.

How is Mylo™ material more sustainable than synthetic leathers?

Unlike synthetic leather, which is usually made from a synthetic fabric and a polyurethane or PVC coating,  Mylo material is made from mycelium and is not petroleum-derived. Additionally, Mylo material’s processing and finishing chemistries are intentionally evaluated and selected using Green Chemistry principles. We will undertake a full impact assessment of Mylo material in 2022 and we look forward to sharing those findings with the world.

Is Mylo™ material biodegradable?

Our goal with Mylo material is to consider every aspect of the lifecycle and reduce its environmental impact throughout the whole process. The mycelium used to make Mylo material is infinitely renewable and grown by expert mushroom farmers and scientists in indoor vertical farming facilities in Europe and the United States.

Mylo material is not currently biodegradable, which is the case for pretty much all leather and alternative leathers that we are aware of. Sustainability is a measure of inputs and processing steps as well as end of life. In the future, we hope to create versions of Mylo material that can be repurposed and reused as long as possible, and then be returned to natural and industrial systems in a cycle that is truly sustainable.

Is Mylo™ material plastic/petroleum-free?

While Mylo is not currently plastic-free, it is not petroleum-based, unlike synthetic leather, which is made from a synthetic fabric and a polyurethane or PVC coating (meaning it’s 100% plastic). Most animal hides are finished with added chemistry (up to 40% of the weight of leather is fat liquors, plasticizers, and coatings), whereas all Mylo inputs are based on rigorously applied principles of Green Chemistry and minimal environmental impact.

Mylo is also certified 50-85% bio-based, meaning it’s made predominantly from inputs that are derived from renewable ingredients found in nature. This certification is received through bio-based testing by DIN CERTCO

We believe that eventually eliminating plastics is the right goal for Mylo and we are always striving to increase the bio-based content as well. But we also know that a material’s potential for impact depends on brand and consumer adoption, and a majority of consumers will not accept big sacrifices in quality compared to leather. We have not yet seen a completely plastic-free product that meets brand and consumer requirements for softness, strength, and suppleness, but we will keep working toward that goal with Mylo.

Can I buy Mylo™ material?

Thank you for your interest! These are exciting times for us and we are overwhelmed by the demand for Mylo material. While Mylo material is not currently available for sale beyond our exclusive consortium partners, we are working to increase supply to work with additional brands and designers in the future. Please continue to check back for more updates.

Can I buy the adidas Stan Smith Mylo™ shoes?

adidas Stan Smith Mylo is a concept shoe and isn’t available for purchase yet. adidas plans to release a small drop at the end of 2021 and scale up from there.

Can I buy the Stella McCartney bustier top and trousers?

As a long term partner of Bolt Threads, Stella revealed a Mylo™ bustier top and trousers in March 2021 as part of her latest exploration into designing with Mylo. These items are part of her design process to inform future designers featuring the material and are not currently available for sale; Stella plans to launch further Mylo products in the months ahead that will be available for consumer purchase. We look forward to sharing those details when we can.

When will Mylo™ consortium products be available, and where can I purchase them?

The first Mylo material products will be available starting in 2021. Product availability and timing will vary by designer, and we look forward to sharing exact dates as they are available.

close

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.