Soybean Yarn: An Incredibly Soft Alternative Plant-Based Yarn
- Caterina Sullivan
- Mar 10
- 5 min read
Updated: 2 days ago
It might not be the first fibre that springs to mind when you’re browsing yarn, but soybean yarn is one of the more interesting and alternative plant-based options available to makers today. Soft, breathable and made from a byproduct of food production, it has become a new favourite at Fancy Yarns.
What exactly is soybean yarn? How is it made? What does it feel like to work with, and why might it find a place in your next project? Let’s get into it.
What is Soybean Yarn?
Soybean yarn, sometimes called soy yarn, soy fibre or vegetable cashmere, is a textile fibre derived from the protein found in soybeans. What makes it particularly interesting is where it comes from in the production chain: soy fibre is made from the leftover soybean pulp that remains after soybeans are processed for tofu or soy milk production.
That means the raw material isn’t grown specifically for yarn. It’s the part of the soybean that would otherwise be discarded, making soy fibre one of the clearer examples of circular resource use in the textile industry.
The resulting yarn is smooth, with a noticeable lustre and a drape that sits somewhere between cotton and silk. It’s a plant-based fibre that performs well and for makers who love both the feel and the story behind what they’re working with, it’s a rewarding one to explore.
How is Soybean Yarn Made?
The production of soybean yarn is more involved than a bast fibre like linen or hemp, but the starting point in agricultural waste gives it a more considered environmental profile. Here’s how it works:
1. Starting with Food Production Waste
The process begins not in a field but in a food factory. The leftover soy pulp from tofu or soy milk production contains proteins that act as the base for the fibre. This residual material, called okara, is what gets transformed into yarn.
2. Protein Extraction and Processing
The proteins are extracted from the pulp using a water-based process, then liquefied to form a thick solution. Manufacturers can use either alkali or natural enzymes to render the soy protein into a suitable state for fibre processing, with enzyme-based methods being the more environmentally sound option.
3. Spinning into Fibre
The protein solution is extruded through spinnerets into fine filaments, which are then solidified and stretched to form strong fibres. The spinning method used at this stage (wet or dry) influences the final texture of the yarn, with dry-spun fibres tending to have a smoother surface and better strength.
4. Finishing and Dyeing
After drying and cutting, the fibres are spun into yarn ready for use. Dyeing can happen at the yarn or fabric stage, and soy fibre is known for absorbing dye beautifully, requiring less dyestuff compared to many conventional fabrics.
It is worth noting that some producers use formaldehyde treatments at the finishing stage to improve crease resistance and durability. Certain soybean textile producers have begun using polycarboxylic acids instead of formaldehyde , which is the more responsible approach. When buying soy yarn, it’s worth looking for producers who are transparent about their processing methods.
What does Soybean Yarn Feel Like?
This is where soybean yarn earns its nickname. Soybean fibre is often compared to silk for its beauty and lustre and to cashmere for its softness.
In practice, it has:
• A smooth, gentle hand that feels comfortable against the skin
• A natural sheen that is less intense than silk, but noticeably present
• A lovely drape that works beautifully in flowing, structured and garment-weight projects
• Good breathability and excellent moisture-wicking properties, which help keep the body comfortable by drawing sweat away
• A hypoallergenic quality that makes it a good option for makers with sensitive skin
It’s a particularly good warm-weather fibre due to its lightweight, breathable and comfortable to wear nature without the weight or bulk. For garments you’ll reach for again and again, that combination of softness, drape and breathability is incredibly useful.
The Environmental Picture: An Alternative Plant-Based Yarn
Soybean yarn has a thoughtful fibre story, though like most eco materials, it’s worth understanding the full picture.
The good news:
The fibre originates from agricultural waste rather than a dedicated crop, which gives it an environmental profile that offsets much of the complexity involved in processing. The soybean has already been grown and processed for food. The fibre is simply what remains.
Some manufacturers use a closed-loop system in production, meaning the chemicals involved are recycled and reused throughout the manufacturing process, significantly reducing waste and environmental impact. Modern facilities have also developed closed-loop water systems that recycle over 90% of process water.
Soybean fibre is also biodegradable. When items reach the end of their life cycle, they can be composted rather than contributing to landfill waste.
The nuances:
The plant requires a notable amount of water for cultivation at industrial scale, though organic soy can be grown more sustainably on a smaller scale.
Biodegradability and compatibility with low-impact processing support soy’s eco-friendly profile, though soybean agriculture and chemical processing practices vary by supplier.
What is Soybean Yarn Good For?
Soybean yarn is a versatile, wearable fibre that suits a wide range of projects. Its drape and breathability make it particularly well suited to:
• Lightweight tops, tees and summer cardigans
• Shawls, wraps and cowls
• Scarves and accessories worn close to the skin
• Baby garments, where softness, antibacterial and hypoallergenic properties matter
• Weaving projects that benefit from sheen and drape
Due to its smooth texture and natural lustre, soy yarn works beautifully in both simple and detailed stitch patterns. Clean, open stitches and lace structures allow the fibre’s sheen to show through. Simpler stitches let the drape speak for itself.
Tips for Working with Soybean Yarn
Swatch first. Like many plant-based fibres, soy yarn has limited elasticity. A swatch helps you understand how it behaves on your chosen needle or hook size before committing to a full project.
Watch your tension. Due to the fact it doesn’t have the stretch of wool, tension can feel different, especially for makers who usually work with animal fibres. A slightly relaxed tension often gives the best results.
Use smooth tools. Metal or polished wood needles and hooks work well with the smooth texture of soy fibre and help maintain an even gauge.
Wash with care. Soy yarn responds well to a gentle cool wash. Lay flat to dry and avoid high heat, which can affect both the softness and the lustre of the fibre. Store away from prolonged light exposure to maintain fibre integrity and colour quality.
Block gently. A light steam block or damp cloth works well, and can help your finished piece settle into its full drape.
Why Soybean Yarn is Worth Exploring
Soybean yarn sits in an interesting space in the plant-based fibre world. It’s softer and more lustrous than cotton, more accessible in price than silk and more wearable in warm weather than most wool blends. For makers who love fibres with a more considered material story, it offers that too, starting from what might otherwise have been waste.
It’s a newer plant fibre yarn gaining popularity due to its soft, luxurious feel and drape, along with being naturally hypoallergenic and biodegradable.
If you’re building out your knowledge of plant-based fibres, soybean yarn is a very satisfying one to add to the list.
Browse our full range of plant-based and eco yarns online. We ship directly from Canberra across Australia.
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We write our fibre guides to help you make informed choices, not just inspired ones. If you have questions about soybean yarn or any other fibre we stock, we’re always happy to help.
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