Wool isn’t just for winter, knits, or outdoor gear anymore.
It’s also the secret behind some of the most luxurious and high-performance denim on the market. But here’s the good news: the wool and denim industries are ready to let that secret out.
In May, The Woolmark Company, the global authority on Merino wool, launched “The Wool Lab Denim Edition,” a comprehensive digital sourcing guide for wool denim fabrics. As the conversation around sustainability and innovation in denim accelerates, Clementine Hurley, The Woolmark Company’s business development manager, fashion and product, said the organization recognized it had the opportunity to lead by providing real, tangible tools to the industry.
Related Stories
With this expert-driven resource, designers and manufacturers can explore the full potential of wool in denim, combining innovation with technical precision. The guide presents seven wool denim categories: A Revised Classic, Special Treatments, Denim Shirting, The Denim Suit, Signature Denim, Thread Rebels, and Denim-Inspired Knits and Jerseys. An accompanying toolkit, developed in collaboration with Woolmark’s global network of textile experts, provides in-depth insights into wool’s performance in denim applications, offering guidance on fiber selection, fabric construction, finishing techniques and sustainability practices.
However, the guide is not just a trend forecast. Hurley said its a materials roadmap, bringing together the latest commercially available wool denim developments, making it easier for industry players to experiment, collaborate and bring new products to market faster.
The Wool Lab Denim Edition is Woolmark’s most targeted response yet to the increasing number of requests the organization receives from mills, brands, and designers exploring the role of wool in denim innovation, according to Hurley. From jeans to shirting, indigo-dyed knitwear and chambrays, the previous season swatch requests highlighted how in demand the wool denim category has become.
“Over the past few years, we’ve seen a clear shift: denim is no longer viewed as a purely cotton-dominated category. The interest in wool denim is absolutely growing—and we’re seeing that first-hand at Woolmark,” she said.
The interest is coming from multiple directions. “On the supply side, mills are seeking to differentiate with hybrid yarns and more sustainable dyeing methods, many of which are uniquely compatible with wool. On the brand side, we’re seeing a clear adoption for natural fiber alternatives that align with their sustainability goals—without compromising on performance or design,” she said.
Wool-blended denim is increasingly popular for its premium and sustainable qualities, but it’s also capturing attention for its versatility. Nicole Ajimal, WGSN’s fabric sourcing editor, said the fabric is especially favored in outerwear, tailored styles and high-end casualwear, highlighting how “the boundaries between smart and casual fashion continue to blur, drawing inspiration from one another.”
“The primary focus appears to be on comfort, as the soft, luxurious feel of the material is appreciated, and finishing techniques enhance its surface texture. With the introduction of machine-washable wool, more affordable and accessible options for denim-wool blends are now available, appealing to a wider audience,” she said.
Indeed, denim is a fiber-obsessed category, from mono-fiber constructions for recyclability to more innovative, blended or alternative approaches.
Hurley said this shift reflects a broader evolution in mindset: from chasing low-cost volume to prioritizing functionality, sustainability, and innovation. “Wool’s resurgence in denim isn’t just about novelty. It’s about meeting modern expectations. It offers natural stretch, breathability, odor resistance, and thermoregulation. That resonates in a market where consumers are demanding more from their garments both technically and ethically,” she said.
Changing perceptions
For wool, undoing long-held misconceptions that designers and consumers have about the fiber and its purpose in textiles is a unique hurdle to face. For decades, designers and consumers have been taught to believe it’s a winter fiber and is complicated to care for. “One of the biggest misconceptions about wool-blended denim is that it’s only suited for colder weather, when in fact it’s often softer, more breathable, and more versatile than traditional 100 percent cotton denim,” Hurley said.
Consumers also assume it’s high-maintenance or won’t wear well, but many wool blends can be cold-washed at home in a washing machine and develop a unique patina over time. “Wool adds elasticity, temperature regulation, and drape to improve comfort, especially for the active consumer. It’s not just a luxury fiber, it’s a versatile fiber that gives a technical and innovative upgrade to traditional denim,” Hurley said.
In 2022, Pioneer Denim became the first Bangladeshi mill to introduce wool denim and has been growing the category ever since. Using wool sourced from Australia, Pioneer offers wool denim made with 10-30 percent Merino wool in weights ranging from 7oz. to 12.5oz. and in a variety of indigo and black washes.
“We are observing a visible market shift at this moment in terms of customers’ preference for premium and luxurious fibers. Customers nowadays are interested in denim with more unconventional and premium fibers like merino wool, silk, nylon, hemp, linen and pineapple,” said Christian Reca, head of marketing and merchandising at Pioneer.
While cashmere has been part of Berto’s collection for several seasons, the Fall/Winter 2026-2027 collection marked the first time the Italian mill used 100 percent Merino Tec wool weft. The special wool means the fabrics are easy to handle, machine washable and even suitable for tumble drying.
“At Berto, we see a fair level of demand for fabrics made with these types of fibers,” said Francesca Polato, Berto’s marketing manager. “They help our clients attract their end customers, who recognize and appreciate the value of noble fibers in a garment.”
Berto sources the Merino wool from Südwolle. The collection includes three fabrics in different weights, ranging from 8oz. to 12oz. They all feature a blended composition of approximately 60 percent cotton and 40 percent wool. The Merino Tec wool weft means the fabrics are easy to handle, machine washable, and even suitable for tumble drying.
While Polato said customers choose the fabrics for wool’s inherent tangible qualities like softness and warmth, they’re also drawn to its exclusive nature. “I believe they’re drawn to it because wool denim is still quite rare, so it may represent something new and appealing to their own customers,” she said.
Working with wool
The Woolmark Company recommends merino wool ranging from 17.5 microns to around 22 microns for denim, with 19.5 microns being the most common. Yarn counts vary from finer counts used in lightweight shirting fabric, to coarser yarns suited to heavier bottom-weight fabrics. Wool can be used in both warp and weft yarn.
Given denim’s global popularity, Hurley emphasized the importance of ensuring that wool denim is equally accessible across the market — from luxury fashion to the high street. Though more mills are expanding on their core ranges and are now offering an extensive diversity of wool denim across various categories, from luxury to streetwear, wool denim previously only sat firmly in the premium to luxury tier of the market—and that was reflected in the cost.
The premiumization of wool denim may be due to its challenging nature to work with. Hurley said wool and cotton behave very differently during spinning, dyeing and finishing. Cotton is a short staple, while Merino wool has crimp and natural elasticity, which could challenge some traditional denim weavers. Working with it requires specialized dyeing and finishing techniques that aren’t part of conventional denim production.
“It’s not that easy. Wool yarn is very delicate, so great care must be taken during both the weaving and finishing phases. Additionally, extra caution is needed when washing the garment—stone washing or chlorine-based treatments should be avoided, as they would damage the wool component,” Polato said.
Traditional denim treatments like heavy washing and finishing once risked damaging wool, but Hurley said new dyeing and finishing methods have been developed to overcome this. Notable solutions include the Sara Process, which allows fabric-level dyeing that replicates the high-contrast fades of ring-dyed indigo denim without the need for yarn dyeing. Hurley said this not only suits wool’s structure but also dramatically reduces water, chemical, and energy usage.
“Huilai Biotechnology is another innovation, using natural indigo screen printing and cold dye bath techniques to create rich, textured, and faded looks on 100 percent wool fabrics—achieving the aesthetic of worn denim without harsh processing,” she said.
For pigments, COLOURizd’s QuantumCOLOUR technology infuses pigments directly into the fiber, eliminating traditional wet dyeing altogether. This approach allows a wide range of effects and maintains wool’s integrity.
“While wool can’t withstand traditional denim finishing cycles, these modern technologies provide equally effective—and environmentally responsible—alternatives, paving the way for pure wool denim fabrics,” Hurley said.
Sustainability and performance
Wool brings a host of natural performance benefits to denim, enhancing both comfort and functionality without compromising the classic denim look. The optimal wool content in denim depends on the intended product and performance, but 30 percent wool is generally the minimum level that consumers noticeably experience the benefits—including enhanced warmth, moisture management, elasticity and wrinkle resistance.
When used in the weft yarns, Hurley said wool sits against the skin, adding warmth and eliminating the chill often associated with traditional denim—especially in colder climates. It also improves moisture management, keeping the fabric feeling drier and more comfortable when wet, which is a major benefit in unpredictable weather. Meanwhile, wool’s natural elasticity allows the fabric to stretch and recover more effectively, helping denim maintain its shape over time. This makes wool denim ideal for travelers.
Hurley said wool is mostly blended with cotton to retain denim’s structure and traditional aesthetic, but newer combinations like wool-lyocell, wool-linen/hemp, and wool-synthetic blends are gaining traction. These alternative blends offer unique sustainability and technical performance advantages that are being explored more widely to meet the diverse needs of global denim markets. Brands such as Max Mara have used innovative 100 percent wool denim fabrics that replicate the look and style of traditional denim, with the added natural benefits of Merino wool, including increased softness and warmth.
On the practical side, specially treated wool can be made fully machine washable, making wool-blended denim just as easy to care for as traditional jeans. Added to this are wool’s natural stain resistance—thanks to its lower surface energy—and its ability to resist odors, which aligns perfectly with denim’s wash-seldom culture.
“All of these properties combine to create a smarter, more versatile version of denim that performs better in everyday life,” Hurley said.
This story was published in SJ Denim’s fall issue. Click here to read more.
