Following last year’s initial release, Untouched World has carried over three core styles from the previous season—the Fountain Sweater, Maelyn Tee, and Arlee Singlet. Each piece is crafted from a blended fabric of 90% organic cotton and 10% Brewed Protein™ fiber, combining the familiar comfort of cotton with the soft, gentle hand feel of Spiber’s next-generation protein material.

Arlee Singlet – A soft, close-fitting singlet with a high round neck and hip-length hem, designed as an easy summer layer.

Fountain Sweater – A statement striped crew-neck sweater combining timeless design with the extraordinary softness of a 90% organic cotton and 10% Brewed Protein™ blend.

Maelyn Tee – A perfectly proportioned T-shirt with a classic crew neckline and elbow-length sleeves, balancing relaxed comfort with refined, versatile style.

Carrying these favorite designs forward into a second season builds on the collaboration between Untouched World and Spiber  , and continues the exploration of Brewed Protein™ fiber in everyday wardrobe staples.

To explore the collection and learn more about the collaboration, visit Untouched World’s Brewed Protein™ page.

me ISSEY MIYAKE, a brand by ISSEY MIYAKE INC., has released a new bag, “PROTEIN COTTON KONBU,” featuring Spiber’s Brewed Protein™ fiber. The bag was released on September 1, 2026.

© ISSEY MIYAKE INC.

“PROTEIN COTTON KONBU” is a seamless knitted bag made from a blend of Brewed Protein™ fiber, cotton, and nylon, and finished through garment dyeing. Despite its lightweight construction, the bag features a distinctive texture that combines a kelp-like firmness with a gentle softness. It is available in two sizes, large and small, and comes in three colors: ivory, charcoal, and pumpkin.

Through “PROTEIN COTTON KONBU,” Brewed Protein™ fiber has been developed into a product with a new expression through me ISSEY MIYAKE’s unique knitting techniques and garment-dyeing process, further expanding the possibilities of the material.

Spiber is honored to collaborate with me ISSEY MIYAKE in exploring how Brewed Protein™ fiber can complement the brand’s free approach to making. Through partnerships like this, Spiber will continue to explore the possibilities of materials through creative dialogue.

Brewed Protein™ is Spiber’s signature innovative material, brought to life through years of dedicated, passion-driven research. As Spiber prepares to celebrate its 20th anniversary in 2027, this launch marks the beautiful culmination of two decades of development. It proudly demonstrates that Brewed Protein™ has entered an exciting new era—stepping into the spotlight as a fully mature, standalone textile category.

At our exhibition booths, we will showcase a diverse array of fabrics and finished products made from 100% Brewed Protein™, highlighting their unique aesthetic qualities and inspiring creative applications.

Moving forward, Spiber is dedicated to expanding the horizons of Brewed Protein™ production and adoption. By working hand-in-hand with forward-thinking partners in Japan and across the globe, we aim to pioneer a completely new chapter in materials and bring meaningful, sustainable value to the global fashion community.

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100% Brewed Protein™ Double Face

Milano Unica

・Date: July 7th – 9th, 2026
・Venue: Rho Fiera Milano
・Booth Sector：The Japan Observatory (Hall 1)
・Booth Number: Stand JOB A06

Event details can be found here.

Pitti Immagine Filati

・Date: June 24th – 26th, 2026
・Venue: Firenze Fortezza da Basso
・Booth Sector：CustomEasy
・Booth Number: Piano Inferiore, Stand K/18

Event details can be found here.

The press release is available here.

Spiber and Stella McCartney have spent more than four years developing materials together and exploring new possibilities for creating the ideal expression for the collection. Stella McCartney has long challenged the conventional notion that luxury must depend on animal-derived materials. This collaboration goes beyond simply introducing a new material; it represents an effort to expand the very definition of luxury.

Much of the fashion industry’s environmental impact originates from raw materials. To fundamentally reduce this impact, it is necessary to rethink not only how products are designed, but also how the materials themselves are produced. Spiber’s Brewed Protein™ fiber makes it possible to produce protein-based materials through fermentation rather than livestock farming. Moving from ranching to precision fermentation represents a structural transformation in the way materials are produced.

The collection features exceptionally fine Brewed Protein™ fibers with a fiber diameter of 12–14 microns, contributing to their distinctive texture and smooth, refined hand feel.

Items featuring Brewed Protein™ fiber are scheduled to launch as part of the Stella McCartney Winter 2026 collection. The official launch date will be announced at a later time.

Going forward, Spiber will continue to work alongside Stella McCartney as a partner in advancing new possibilities for fashion through next-generation materials, pursuing a balance between creativity and more responsible manufacturing.

The collection features a yarn that combines Brewed Protein™ fiber—known for its fine, smooth surface—with cotton. The distinctive texture of the protein-based fiber is complemented by the gentle touch of cotton, creating a soft, enveloping feel and everyday comfort.

To honor the material’s natural character, the yarn is intentionally left undyed. This approach preserves its inherent color and texture, allowing JUUKIFF’s design philosophy, “A Structured Intimacy”—a balance between structure and softness—to be expressed through this collection.

We are truly honored that our circular approach and long-term commitment to responsible material development have resonated with JUUKIFF, leading to the continued adoption of our materials in the Spring/Summer 2026 collection, following Spring/Summer 2025.

Product Details

STRING HOLTER TOP IN PROTEIN MIXED COTTON

Color: Ivory
Composition: 90% Cotton, 10% Brewed Protein™ fiber
Price: ¥28,600 (tax incl.)

SIDE SLIT SKORT IN PROTEIN MIXED COTTON

Color: Ivory
Composition: 90% Cotton, 10% Brewed Protein™ fiber
Price: ¥33,000 (tax incl.)

Availability

Korea: JUUKIFF official online store 
Japan: Available at selected retailers including Jurk (Tokyo) and Kiow (Hiroshima)

Exact launch date to be announced via Instagram.
Learn more here.

The latest release introduces a bolero and a long dress. Undyed Brewed Protein™ fiber is woven into the weft, allowing the material’s natural color to remain visible. By leveraging the differential shrinkage between fibers, the fabric develops a distinctive three-dimensional pleated texture.

Through this approach, the inherent characteristics of protein-based fibers are carefully brought to the forefront, presenting new possibilities for material-driven expression.

We are honored that our material has been adopted through A-POC ABLE ISSEY MIYAKE’s unique perspective and creative vision. Spiber will continue working with partners to expand the potential of materials and explore new expressions for the future of clothing.

As part of its JAPAN COLLECTION, THE NORTH FACE—an outdoor brand operated by Goldwin in Japan—has unveiled a collection that reinterprets the traditional Japanese craft of sashiko through a contemporary lens, combining Japanese craftsmanship with advanced outdoor technologies. Within this collection, the Nuptse Hanten Jacket and the Nuptse Sashiko Hanten Jacket incorporate Brewed Protein™ fiber, developed by Spiber.

The collection presents products that bring together sashiko, a symbol of Japanese handcraft, and the structural concept of the short winter hanten coat, while integrating the functional performance required of outdoor apparel alongside emerging material technologies.

Among these offerings, we are honored that our material has been adopted in two reinterpreted versions of the iconic Nuptse jacket—first introduced in 1992 as a mountaineering jacket and now widely embraced as an everyday garment—as well as in the highly popular Nuptse Bootie.

Goldwin and THE NORTH FACE’s continued commitment to creating new value at the intersection of tradition and innovation offers meaningful inspiration for us. Spiber will continue working closely with partners to expand the possibilities of materials and contribute to the evolution of future-oriented manufacturing.

Spiber will participate in Pitti Immagine Filati and Milano Unica in Italy, where we will showcase our Brewed Protein™ fibers along with the latest developments in yarns and fabrics.

Milano Unica

・Date: January 20-22, 2026
・Venue: Rho Fiera Milano
・Booth Sector: The Japan Observatory (Hall 12)
・Booth Number: Stand JOB D02

Event details can be found here.

Pitti Immagine Filati

・Date: January 21-23, 2026
・Venue: Firenze Fortezza da Basso
・Booth Sector: CustomEasy
・Booth Number: Stand Q/8

Event details can be found here.

The fleece jacket combines a fur material made from a blend of Brewed Protein™ fiber and silk with a boa fleece fabric based on the bio-derived material PlaX. In addition, the use of pattern-optimization techniques in the production process contributes to reducing fabric waste, resulting in an innovative piece that reflects the designers’ forward-looking approach.

The material and structural design perspectives explored by J.L-A.L and Goldwin open up new possibilities for apparel development, and we are truly pleased that our material could once again be incorporated into a part of their collection this year. The collaboration continues to serve as a meaningful source of inspiration for us.

Available now on the J.L-A.L official site:
j-la-l.com/collections/goldwin_x_j-l-a-l_

IN HOUSE, known for its dedication to innovative and sustainable design, has become the first U.S.-born brand to adopt Brewed Protein™ fiber. This collaboration marks an important milestone in Spiber’s efforts to expand its materials into the U.S. fashion market.

Launched in September 2025, the collection consists of six tailored pieces—the Zip-Up Blazer, Button-Up Blazer, Work Skirt, Work Pant, Skirt Pant and Double Skirt—with only the black color versions crafted from a wool blend fabric that incorporates Brewed Protein™ fiber.

Each item is available through a made-to-order system and is currently sold exclusively within the United States.

Learn more here.

As global demand for sustainable nutrition grows, we are committed to developing functional food proteins that do not rely on animals or traditional agriculture. We are proud to join the GFI community of innovators and are more committed than ever to helping build a sustainable, biobased economy. We thank The Good Food Institute (and GFI Japan) for including us, and look forward to collaborating with fellow GFI members, consumer brands, ingredient companies, and strategic partners to create the next generation of food ingredients.

You can now find our information on the GFI website.

Learn more about Spiber’s food project here.

Features of Spiber Tee 001

• Premium, skin-friendly comfort: The T-shirt uses an ultrafine 14-micron grade Brewed Protein™ fiber blended at 7%, paired with 93% single-origin Australian cotton (“HASE-1”). Traceability is ensured throughout all stages from raw cotton sourcing to spinning, knitting, and sewing. The 40-count twin yarn, produced using technology by Hasetora Spinning and knitted at high density on a 24-gauge machine, results in a fabric boasting both softness and structure.
  
  
• Meticulous pattern design, sewn with cotton thread: The sleeve, side, and neckline patterns are precisely designed to the single degree and millimeter. Sewing is done with cotton thread rather than polyester, requiring skilled workmanship to achieve durability and comfort. The sleeve hems feature a tenchi-biki finish for a smooth and refined appearance.
  
  
• Natural odor control: The material neutralizes ammonia and acetic acid, helping suppress odor at its source. The effect continues even after repeated washing (based on JIS standard tests; actual effectiveness may vary based on usage environment).
  
  
• Next-generation production and distribution: Brewed Protein™ fiber is manufactured in Tsuruoka, spinning and knitting take place in Bishu, dyeing and finishing in Osaka, and sewing in Kumamoto, resulting in a product fully made in Japan. Bonmax maintains inventory of the blank T-shirt body, enabling small-lot ordering starting from one piece, and also supports secondary processing such as sublimation printing and embroidery. This approach moves away from mass-production and aims to deliver products only when and where they are needed.
  
  

Product lineup:

• Spiber Tee 001 with Brewed Protein™: JPY 9,900 (incl. tax) + shipping
• Spiber Logo Tee 001 with Brewed Protein™: JPY 11,000 (incl. tax) + shipping
• MR DQ Tee 001 with Brewed Protein™: JPY 11,000 (incl. tax) + shipping

Colors: White/Black
Sizes: S/M/L/XL
Material: 93% cotton, 7% Brewed Protein™ fiber

This T-shirt brings together everyday comfort and a commitment toward a more sustainable future. We invite you to make it a staple in your daily wardrobe.

How to purchase:

This product can be conveniently purchased through Spiber’s official LINE account (available only in Japan).

1. Scan the QR code below or click the link.
2. Add Spiber’s official LINE account as a friend.
3. Purchase via the store menu in the LINE chat screen.

Click here to add official LINE account

The festival is a one-day, hands-on event where visitors can “see,” “touch,” “learn,” and “enjoy” science at Tsuruoka Science Park—one of the region’s leading research hubs. Through collaboration among research institutes, companies, and the local community, the event offers people of all ages an opportunity to engage with science, technology, and local industries.

On the day of the event, Spiber’s main research building (1F entrance) will be open to the public, featuring exhibits of Brewed Protein™ materials and apparel products, as well as limited-edition T-shirts available for purchase.

Researchers from Spiber will also introduce the characteristics of microorganisms and explain the Brewed Protein™ material production process. In addition, the dress provided by Spiber for Hikaru Utada’s SCIENCE FICTION TOUR 2024, marking the first time a material development team has contributed to the artist’s tour wardrobe, will also be on display.

Date: Saturday, November 1, 2025, 9:30 a.m.–3:30 p.m.
Venue: Tsuruoka Metabolome Campus and surrounding facilities

Official Website (Japanese only)