Functional Yarn Varieties and Specifications and Special Yarns

When buyers ask about yarn varieties, they often want one simple answer. In practice, it is rarely that simple.

Wool-type yarns, linen yarns, ramie and hemp yarns, functional yarns, differentiated yarns, and special fiber yarns all belong to different parts of textile development. People often group them together, but each category behaves differently in spinning, knitting, dyeing, and final fabric performance.

At VI-TEX, we run into this in a very direct way. A customer may ask for a cooling effect, but the base count is not right for the fabric. Another may want a natural dry hand feel, but the selected blend is too rough for stable knitting. In our sample room, 21S and 30S still come up again and again on development sheets because they give us a quick read on whether a yarn is moving in the right direction.

So this article stays with the original subject and sorts the material more clearly: first the common yarn systems and specifications, then the main range of functional and special yarns.

Carded Wool Yarn

Carded wool yarn is spun on a carded wool system. It contains more short fibers, the fiber arrangement is less even, and the yarn surface usually has more fuzz. It is not as smooth or as strong as combed wool yarn, but it gives a fuller and thicker fabric.

For some products, that fuller look is exactly the point.

Semi-Combed Wool Yarn

Semi-combed wool yarn falls between combed and carded yarn. The process is simpler than combed spinning, but finer than carded spinning. It shortens the process, helps reduce cost, and keeps a balanced performance level.

It is mainly used for weaving and knitting. The common linear density is around 10-33 tex.

Linen Yarn Specifications

Linen remains an important yarn category in both woven and knitted developments. Buyers choose it for a natural look, a dry touch, and a breathable structure. But linen on paper and linen in production are not always the same thing. The count matters, and the spinning route matters too.

Pure Linen Yarn

• Wet-spun linen: 6S, 14S, 17S, 21S, 35S
• Dry-spun linen: 6S, 9S, 14S
• Pure linen slub yarn: 3N-20N
• Pure linen dyed yarn: 10N-36N
• 100% linen air-spun yarn: 4.5S, 6S, 8S, 11.5S

Wet-spun linen is usually cleaner in appearance. Dry-spun linen tends to feel more rustic. That difference may look small in a spec list, but it shows up quickly once the fabric is knitted.

Linen Blended Yarns

Linen blends are widely used because they are easier to control in real production. They help balance natural texture, softness, processing stability, and cost.

• Linen 55% / cotton 45% air-spun: 6S, 8S, 11S, 15S
• Linen 55% / cotton 45% ring-spun: 11S, 21S, 30S
• Cotton 70% / linen 30%: 21S, 30S
• Cotton 85% / linen 15%: 21S, 32S
• Polyester 85% / linen 15%: 21S, 32S
• Polyester / linen 70/30: 32S
• Polyester / linen 45/55: 21S, 32S
• Viscose 85% / linen 15%: 21S, 30S
• Viscose / linen 70/30: 21S, 32S
• Viscose / linen 55/45: 21S, 32S
• Acrylic / linen 85/15: 21S, 32S
• Acrylic / linen 70/30: 21S, 30S
• G100 Tencel / linen 70/30: 21S, 30S
• Modal / linen 70/30: 30S

From our side, linen blends usually make development easier. They are often more forgiving in knitting than pure linen, and they give buyers more room to tune hand feel and cost.

Stretch Linen

• 10S, 16S ramie cotton + 70D
• 11S, 20S linen cotton + 70D / 40D

Stretch linen is useful when the product needs a better fit or a little more recovery. We have seen this work well in socks and light knitted apparel where pure bast fiber would feel too stiff on its own.

Ramie and Hemp Yarns

Ramie and hemp belong to the same larger conversation. They are chosen when the target is a drier touch, visible fiber character, and a more natural fabric expression.

Pure Ramie

• Combed: 14S, 19S, 21S, 28S, 35S
• Air-spun: 6S, 9S, 12S

Ramie Cotton

• Ramie 55% / cotton 45% air-spun: 7S, 10S, 16S
• Ramie 55% / cotton 45% ring-spun: 11S, 16S, 21S, 30S
• Cotton 70% / ramie 30% combed: 16S, 21S, 30S
• Cotton 80% / ramie 20% combed: 40S, 50S
• Cotton 90% / ramie 10% combed: 60S

Hemp Yarn

• Pure hemp: 8.5N, 16N
• Hemp cotton 55/45, 80/20, 90/10: 6S-10S
• Hemp viscose 55/45, 80/20

Some buyers choose hemp because the market likes the fiber story. Others choose it because the final fabric feels firmer and drier. To be honest, both are common in real discussions.

Functional Yarn Varieties

This is still the core of the original article. Functional yarn is a broad category, not one single yarn.

• cooling yarn
• hollow yarn
• heating yarn
• bamboo charcoal fiber
• antibacterial yarn
• flame-retardant yarn
• luminous yarn
• luminous fiber
• low melting point yarn
• hot melt yarn
• conductive yarn
• water-soluble yarn
• normal pressure dyeable fiber
• moisture absorption and perspiration fiber
• anti-ultraviolet fiber
• magnetic fiber

Each of these yarns serves a different purpose. Cooling yarn is often selected for summer socks and lightweight knitwear. Antibacterial yarn is common in socks, underwear, and products where odor control matters. Thermal yarn is used when warmth needs to go up without making the final product too heavy.

What usually causes trouble is not the function itself. It is the mismatch between the function, the yarn count, the machine setting, and the end use. We have seen projects look good in the first discussion and then slow down in trial knitting because that match was not checked early enough.

For more specific product directions, VI-TEX also supplies antibacterial yarn, cooling yarn, dry quick yarn, and thermal yarn for different knitting and apparel programs.

Differentiated Yarns and Special Fiber Yarns

Not every yarn development starts from a clear performance target. Sometimes the customer wants a different surface, a different drape, or simply a yarn that feels less ordinary in the final fabric. That is where differentiated yarns and special fiber yarns come in.

Differentiated Yarns

• Doris yarn
• new synthetic fibers
• high shrinkage yarn
• low shrinkage yarn
• imitation cotton yarn
• imitation linen yarn
• imitation wool yarn
• imitation silk yarn
• imitation viscose yarn
• imitation acetate yarn
• imitation nylon yarn
• thick-and-thin yarn
• self-curling yarn
• colored monofilament
• flat yarn
• environmentally friendly regenerated fiber

Special Fiber Yarns

• cuprammonium fiber
• acetate fiber
• bamboo fiber
• corn fiber
• PTT
• PBT
• nylon 66
• T-400
• SSY / SPH / CEY
• milk fiber
• pearl fiber

These yarns are often used in products that need a more distinct hand feel, elasticity, appearance, or material story. In development work, we usually find it faster to look at the target fabric first and then work backward to the yarn, not the other way around.

Fancy Composite Yarns

Fancy composite yarns also have their place here. They are less about one single function and more about appearance, texture, and blended effect.

• AB composite yarn
• hemp gray yarn
• polyester yarn
• composite silk
• dragon dance yarn
• rainbow silk
• polyester-yang Leli silk
• polyester-polyester composite silk
• polyester-silk cotton yarn
• polyester-nylon composite silk
• back-and-forth bamboo yarn
• air-changing bamboo silk

VI-TEX Experience in Functional and Special Yarns

VI-TEX focuses on functional yarn research, development, production, and stock supply. We are based in Jiaxing, Zhejiang, one of the important textile regions in China. Over the years, we have supported programs that require stable yarn quality, workable specifications, and bulk supply that can actually follow sampling.

That point matters more than it sounds. In busy development periods, especially before seasonal line reviews, a yarn may look acceptable on the spec sheet and still create trouble once it enters knitting. We prefer to catch that early. It saves time for us, and it saves more time for the customer.

Our team supports developments in antibacterial, cooling, quick-dry, thermal, recycled, and other special yarn programs. For buyers looking into more sustainable options, we also supply GRS polyester cotton yarn. If you want to review company background and production capability, you can read more about VI-TEX.

Conclusion

Functional yarn varieties and specifications cover more than one yarn family. Wool-type yarns, linen yarns, ramie and hemp yarns, functional yarns, differentiated yarns, special fiber yarns, and fancy composite yarns each serve different product needs.

Once the classification is clear, yarn selection becomes much more practical. The discussion gets easier too.

If you are developing socks, knitwear, underwear, or apparel fabrics and need support on yarn count, blend, or function, you can contact our team for a more specific discussion.

FAQ

What is included in functional yarn?

Functional yarn usually refers to yarns developed for a clear performance purpose, such as cooling yarn, antibacterial yarn, thermal yarn, conductive yarn, moisture management yarn, and other special performance yarns.

What is the difference between combed wool yarn and carded wool yarn?

Combed wool yarn is smoother, more even, and usually stronger because the fibers are arranged more neatly. Carded wool yarn contains more short fibers, has more fuzz, and usually gives a thicker and fuller fabric.

Why are linen blended yarns so common?

Linen blends help balance natural texture, softness, cost, and processing stability. In many knitting and weaving programs, they are easier to use than pure linen yarn.

How do buyers choose between cooling, antibacterial, and thermal yarn?

The choice depends on the end use. Cooling yarn is more suitable for summer and lightweight products. Antibacterial yarn is often used where odor control matters. Thermal yarn is selected when warmth is the main target.

Can VI-TEX support recycled yarn programs?

Yes. VI-TEX supports recycled yarn developments, including GRS-related programs, along with other functional yarn projects for socks, knitwear, and apparel fabrics.