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Fiber Lexicon: Everything You Need to Know About Fibers

Choosing the right yarn is half the job. Here is an overview of the most common fiber types and what they are best suited for.

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Wool (Sheep)

Animal-based

Sheep wool is the most widely used fiber in knitting. It is naturally temperature-regulating and can absorb significant moisture without feeling wet.

Properties

Warm Temperature regulating Elastic Self-cleaning

Best for

Sweaters Outerwear Winter clothes

Merino Wool

Animal-based

Extra fine wool from Merino sheep. The fibers are thinner and crimpier than regular wool, making it extremely soft against the skin.

Properties

Super soft Non-itchy Breathable Lightweight

Best for

Base layers Baby clothes Sensitive skin
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Alpaca

Animal-based

Fiber from alpacas contains no lanolin (wool fat), making it hypoallergenic. It is significantly warmer than sheep wool.

Properties

Very warm Hypoallergenic Silky soft Lacks elasticity

Best for

Shawls Hats Loose sweaters
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Mohair

Animal-based

Fiber from Angora goats. Known for its luster and "halo" (fuzzy surface). Often blended with silk or wool.

Properties

Lustrous Exclusive Warm Airy

Best for

Lightweight garments Carry-along thread Occasion wear
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Cotton

Plant-based

Plant-based fiber that is durable and breathable. It has no elasticity, making it firm to knit with.

Properties

Cooling Durable Absorbent Heavy

Best for

Summer clothes Washcloths Interior decor
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Linen

Plant-based

Made from the stalks of the flax plant. One of the oldest textile fibers, it becomes softer and finer with use and washing.

Properties

Very cooling Antibacterial Inelastic Glossy

Best for

Summer tops Tablecloths Curtains
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Silk

Animal-based

Produced from the cocoon of the silkworm. One of the strongest natural fibers with a fantastic luster.

Properties

Strong Lustrous Temperature regulating Luxurious

Best for

Tops Shawls Blended yarns

Frequently Asked Questions About Fibers

Why does wool itch?

Wool can itch depending on the fiber's micron count (thickness). Thicker fibers itch more because they poke the skin, while fine fibers like Merino wool bend and feel soft. Some people are also sensitive to lanolin, the natural fat in wool.

What is Superwash yarn?

Superwash is wool that has been chemically treated or coated with a thin polymer to prevent the fibers from felting. This allows the yarn to be machine-washed without shrinking, but it loses some of its natural breathability and self-cleaning properties.

Can I substitute wool with cotton?

It is possible, but remember that cotton and wool behave very differently. Cotton lacks elasticity, so a cotton garment will easily sag and lose its shape if the pattern was designed for wool. Cotton also breathes differently and doesn't warm when wet.

What is a blend yarn and why is it used?

Blend yarns combine multiple fiber types to utilize the best of both worlds. For example, a blend of wool and nylon provides a yarn that is warm but also highly durable (perfect for socks). Silk and mohair are often blended to provide luster and strength to the fuzzy mohair.