"Clothes That Let You Wear Air": Goldwin Tech Lab's Vision for the Future of Apparel That Controls Your Temperature in a Single Layer

Goldwin Inc.'s premier research and development facility, the GOLDWIN TECH LAB, has unveiled apparel equipped with a groundbreaking new technology. This new piece is a half-zip pullover called the “Laminated High-Loft Garment,” developed as a prototype for the UTMB trail-running scene.

Instead of using traditional down, this garment harnesses the insulating power of air, allowing the wearer to freely regulate their temperature by simply adjusting the volume of air inside. Not only is it an environmentally conscious choice, but it's also an incredibly versatile item, designed to be the only layer you need for everything from daily life to trail adventures.

We sat down with Ayako Murai from the company's Product Planning Department, along with researchers Soichi Hirayama, Head of the Tech Lab, and Kota Kimura from the Development Division, to discuss why they turned their focus to "air" and what kind of future this technology will bring to apparel.

A Versatile Garment That Regulates Your Temperature in a Single Layer

The Goldwin Tech Lab is located in Toyama Prefecture, home to Goldwin's headquarters. Every day, the lab works on developing advanced technologies and innovative materials and products that push the boundaries of quality and durability. They have a long history of supporting Japan's top athletes, developing high-performance apparel that helps them excel.

Now, the lab has turned its attention to "air" as the key to its next technological breakthrough. The inspiration behind this focus came from the common practice of layering in mountaineering.

"In the mountains, the weather can change in an instant, and your perceived temperature shifts dramatically with the wind, sun, and altitude. Climbers have to constantly regulate their body temperature by layering items like base layers, mid-layer jackets, rain shells, and down jackets. We started this project by asking ourselves: what if we could create a single garment that you could adjust to your body’s needs?" says Hirayama.

The team focused on air because its volume can be adjusted far more easily than down. The lab started by creating and testing a prototype garment filled with air instead of down.

"The prototype didn’t provide the level of insulation we expected. To discover if it was truly impossible to achieve down-like warmth using only air, we launched a series of full-scale experiments," explains Kimura.

To pinpoint why these products were underperforming, the lab dedicated significant time to fundamental research. Let's take a look at some of the tests they conducted—you'll be amazed by the depth of Goldwin's technical prowess.

First, they ran a thermal-fluid simulation known as CFD (Computational Fluid Dynamics). This technology allowed them to visualize how air moves inside a garment and even understand the precise amount of heat loss caused by that movement.

"We investigated whether a thicker air layer would result in more warmth. We placed spacers between two layers of fabric to simulate an air chamber and tracked the effects of changing its thickness. We discovered that while insulation does improve as the air layer thickens, it hits a plateau at around 11mm. After that, we saw no further improvement," Kimura says.

They determined that even with a substantial air layer, heat was escaping due to convection—air moving around inside the chamber. Subsequently, they tested a new approach: creating a stacked structure within the air layer. This brilliantly restricted air movement and significantly boosted insulation.

Through repeated experiments, the lab devised a laminated structural model to adapt the air-layer simulation results for clothing. This design secures the stacked air layers by bonding fabric layers together with dot-shaped adhesives.

"To confirm if this 'cushion' truly provides thermal insulation, we conducted a heat-loss verification test. The results proved that a four-layer, 16mm air structure has the same thermal performance as a standard 16mm padding," says Kimura.

Even after discovering that air layers could offer warmth comparable to conventional padding, the lab's work was far from over.They continued their experiments to understand the garment’s internal structure in even greater detail.

They CT-scanned the prototype garments and repeatedly went through cycles of prototyping and testing so that a single garment could cover a wide range of insulation levels. From there, they began developing the “Laminated High-Loft Garment” intended for trail running.

Backed by comprehensive data, the team believed the "Laminated High-Loft Garment" had the potential to revolutionize outdoor gear, unveiling the prototype in Chamonix, France, in August 2025. Its construction is designed for continuous movement at a steady pace, featuring a three-layer structure on the body where high insulation is crucial, and a single-layer structure under the arms to ensure freedom of movement.

"Long-distance trail races often have mandatory gear lists that include a long-sleeved base layer and an insulation piece. If we can reduce the number of items, runners can move with less weight. We also felt that in an emergency situation in cold conditions, it could provide a higher level of life-saving insulation. "We haven't yet had many opportunities to test it in actual trail races, but we're working on this project because we believe it has the potential to fundamentally change the way we think about mandatory gear in the future," says Murai.

And she’s right—the effect is remarkable. Thermographic imaging of the garment on a mannequin confirmed that as the air loft increases, so does the insulation. It also showed how temperature can be regulated in specific areas by varying the number of layers.

"We've proven that by changing the volume of air, we can adjust the insulation level from that of a simple windbreaker with no padding or down, all the way up to a highly insulating down jacket," Murai adds.

What the Future Holds for This Technology

The lab's "Laminated High-Loft Garment" is a new technology with the potential to change not only the rules of sport but also how we think about clothing. We concluded by asking the team what kind of future they envision once this technology is perfected, both in and out of the competitive arena.

"When developing gear for the outdoors, our guiding principle is always to 'achieve more with fewer resources.' We hope that the products born from this philosophy will also bring convenience and comfort to everyday life," says Murai.

"What's special about this product is its wide range of adjustable insulation. I'm excited to see how far a product that can be used in any environment—from daily life to the trail—will go. We want to keep demonstrating the impact of cutting-edge technology," says Hirayama.

This prototype from the Goldwin Tech Lab shows promise for applications far beyond specialized sports like trail running. While many of us are eager to get our hands on everyday apparel using this technology, it remains a prototype for now. It's currently in intensive development for a planned 2026 launch, and we can't wait for the official announcement.