The Spool

The future of biomaterials is in the bag

It’s a thrilling day in the evolution of biomaterials! We’ve just launched The Mylo™ special edition of the iconic Chester Wallace Driver Bag, featuring supple, animal-free Mylo – our sustainable material made from mycelium, the underground root structure of mushrooms.

The multi-pocketed functional unisex tote represents the future of accessories, combining innovative and cultivated materials with high-quality design.

Mycelium has never looked so good.


While we partnered with Stella McCartney to make the first Mylo™ Falabella Prototype One for the Victoria and Albert Museum, this is the world’s first commercially available Mylo product. We’ve launched a Kickstarter campaign to find early adopters of innovative products who are always on the lookout for the future of innovation.



Not only is this bag a beautifully-designed collaboration with our friends at Chester Wallace, its creation doesn’t involve raising livestock, which has substantial environmental costs from: the biomass needed to be grown to feed livestock, the land that’s used to grow that biomass that could be otherwise storing carbon, and the significant amount of methane produced.

The totes start at $400 and are available in very limited quantities. Be among the first to back the bag and show the world that we’re ready for a sustainable (not to mention stylish and functional) future.

We’ll continue to develop Microsilk® material and products to advance biomaterials in consumer products, and with Mylo™ we’ve illustrated that our ability to harness inspiration from nature isn’t limited to just one material. We look forward to bringing you even more applications of new biomaterials in the future to fulfill our vision: better materials for a better world.



Stella Meets Mylo

Today we introduced a second new material to the world, with a little help from our friend Stella McCartney. Mylo™ is the world’s first commercially available take on modern leather grown from mycelium, the root structure of mushrooms. (more…)

What we were up to in 2017

As we embark on a new year, we’re looking forward to revealing the surprises we have in store for 2018. We’ll be building on our momentum of 2017, which was a milestone year for us.  (more…)

Why We Went to Wyoming

Your wait for the next Bolt Threads product to hit the market is nearly over! Next week we’ll be unveiling our latest creation, the result of a collaboration with Mountain Meadow Wool Mill. Our partnership with the revitalizer of the American wool industry is so special that it brought us from our Emeryville labs to the Big Horn Mountains on the Western Plains of Wyoming.

Sheep in Wyoming hills

These rambouillet sheep get their pick of Wyoming grazing land


Guest post by Joshua Katcher: Stella McCartney Thinks This Technology Will Save the World

At our recent celebration with Stella McCartney, we were lucky enough to be joined by our friend and sustainable fashion expert Joshua Katcher. Mr. Katcher is an Adjunct Professor at the Parsons School of Design and Founder of Brave GentleMan & The Discerning Brute. He’s on the cutting edge of innovation in fashion and he truly understands the significance of our partnership with Stella McCartney. He wrote his thoughts about our celebration and our partnership with Stella McCartney in an article for the Huffington Post, which we liked so much we’ve shared it below.


The future of fashion is already on display

Our partnership with Stella McCartney has shown that the future of fashion isn’t just in the lab – it’s on the catwalk, in the museum, and on its way to your wardrobe. (more…)

We’ve made a new friend in the fashion world

Today we’re thrilled to announce a partnership with Stella McCartney, a world-renowned brand known for its dedication to eco-innovation. We’ll be unveiling our first collaborative product, a one-of-a-kind custom dress made entirely of Bolt Microsilk™ at the New York Museum of Modern Art’s upcoming exhibit “Items: Is Fashion Modern?” opening October 1st. (more…)

Channeling Spider-Man

What’s blue and red and webbed all over? Spider-Man: Homecoming, the latest installment of our favorite superhero film franchise. We often get compared to Spider-Man, and although we’re not superhuman, we share Peter Parker’s love of science and we’re using technology to make materials we think he’d be proud of. (more…)

Designing a BoltSpun tie: Conversations with a material

On March 10, we launched the world’s first ever human-made spider silk consumer product, a knit silk necktie. Why a tie?


Boltspun knit tie

Our friend and silk expert Fiorenzo Omenetto models the tie with panache



If you haven’t heard, we’ll be presenting special news at SXSW on March 11. The festival began in 1987 as a way for local Austin musicians and creatives to showcase their talents. So why are we appearing at a creative festival?

SXSW logo



Bolt Threads
5858 Horton St, Suite 400
Emeryville, CA 94608

(415) 325-5912
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