Yarn fiber guide

How to choose yarn fiber: cotton, wool, acrylic & more

Fiber changes how yarn feels, stretches, drapes, holds warmth and shows stitches. Compare the typical behavior of common yarn fibers, then check the individual yarn’s weight, gauge, meterage and care before you buy.

Compare fibers ↓ Choose by priority ↓ Choose by project →
Cotton yarn from Yarn Park
Cotton
Wool yarn from Yarn Park
Wool
Acrylic yarn from Yarn Park
Acrylic

First distinction

Fiber is not yarn weight.

Fiber describes what the yarn is made from. Yarn weight describes its thickness category. Cotton, wool and acrylic can each be made in multiple weights, so a pattern asking for DK or Worsted yarn has not yet told you which fiber to choose.

When a pattern specifies both fiber content and yarn weight, treat both as useful clues to the intended fabric. If you change either one, swatching becomes more important.

Compare yarn weights →

At a glance

Common yarn fibers compared

These are typical tendencies, not guarantees. Spinning method, blend percentage, yarn construction and finishing can change how an individual yarn behaves.

FiberTypical behaviorWatch forUseful starting projectsShop
CottonSmooth, absorbent, usually less elastic than wool; often gives clear stitch definition.Can feel heavier in large fabrics; low spring can make fit and recovery different.Amigurumi, warm-weather garments, bags, home projects.Cotton yarn →
WoolTypically springy, insulating and resilient, with good recovery in knitted fabric.Care varies; some wool can felt or shrink, and skin sensitivity differs by yarn.Sweaters, hats, scarves, winter accessories.Wool yarn →
AcrylicSynthetic, broadly available and often easy-care, with behavior that varies by construction.Breathability, surface feel and pilling resistance vary widely between yarn lines.Blankets, accessories, toys and everyday projects.Acrylic yarn →
Bamboo / regenerated celluloseOften smooth with fluid drape and relatively low spring.Can feel slippery or split depending on construction; finished fabric may grow more than springy wool.Light garments, shawls and drapey accessories.Bamboo yarn →
AlpacaWarm, soft-feeling and often drapier with less natural elasticity than many wools.Halo and low spring can soften stitch definition and affect garment structure.Warm garments, shawls, scarves and accessories.Alpaca yarn →
MohairKnown for an airy halo; often used alone at fine gauges or blended/held with another yarn.Fuzz can hide stitches and make unraveling harder; skin sensitivity varies.Light layers, shawls and halo-effect garments.Mohair yarn →
SilkSmooth, strong and drapey with natural sheen and relatively little spring.Low elasticity can change fit; many silk yarns are blends rather than pure silk.Shawls, lightweight garments and special-project blends.Silk yarn →

Choose by priority

What matters most in the finished fabric?

Use these as starting points, then confirm the individual yarn against your pattern and swatch.

Clear stitch definitionSmooth cotton and cotton blends are often useful when you want stitches and small details to read clearly.Explore cotton → Warmth with springWool and wool blends are a practical starting point for warm garments and accessories where recovery matters.Explore wool → Everyday care & broad choiceAcrylic lines offer a wide range of textures, weights and prices; check the care label and individual surface feel.Explore acrylic → Fluid drapeBamboo-derived/regenerated cellulose and silk blends are useful places to look when a flowing fabric matters more than spring.Explore bamboo → Airy haloMohair and mohair blends create a distinctive fuzzy surface that changes both stitch visibility and visual weight.Explore mohair →

The main fibers

How each fiber changes the project

01

Cotton yarn

Cotton is a plant fiber that is commonly used when makers want a smooth surface and defined stitches. Compared with springy wool, cotton typically has less elasticity, so ribbing and fitted shapes can behave differently. Larger cotton projects can also become comparatively weighty.

It is a useful starting point for amigurumi, bags, cloths, home accessories and many warm-weather garments, but the individual yarn’s weight and construction still determine the final fabric.

Shop cotton yarn →
02

Wool yarn

Wool is valued for warmth and natural spring. That elasticity can help knitted fabric recover after stretching, which is useful in sweaters, hats and ribbed accessories. Wool is not one uniform material: softness, halo, care and felting behavior vary by breed, treatment and blend.

Always read the care instructions of the specific yarn rather than assuming every wool can be machine washed.

Shop wool yarn →
03

Acrylic yarn

Acrylic is a synthetic fiber used across many yarn constructions and price points. It can be a practical everyday choice, especially where easy care, broad color choice or larger project quantities matter. But “acrylic” alone does not tell you whether a yarn is plush, smooth, tightly spun or prone to surface wear.

Compare the actual yarn line, not only the fiber label.

Shop acrylic yarn →
04

Bamboo and regenerated cellulose yarn

Many yarns marketed with bamboo use regenerated cellulose made from bamboo. These yarns are often smooth and drapey with less bounce than wool. That can be attractive in flowing tops, shawls and lightweight accessories, but the same low spring can affect fitted garments.

Check whether the yarn is pure regenerated cellulose or a blend, because cotton, acrylic and wool percentages can substantially change the fabric.

Shop bamboo yarn →
05

Alpaca, mohair and silk

These fibers are often chosen for a particular surface or drape rather than as direct substitutes for everyday wool. Alpaca tends to be warm and drapey, mohair is prized for halo, and silk contributes smoothness, strength and sheen. They are also frequently blended with other fibers to balance their behavior.

Alpaca →Mohair →Silk →

Do not overlook blends

A blend can be more useful than a “pure” fiber.

Blending fibers lets a yarn combine properties. Cotton/acrylic blends can add some resilience and lighter handling to cotton-rich yarns. Wool/acrylic blends can balance warmth, price and care. Mohair or alpaca blends can add halo or warmth without making the whole yarn from that fiber.

The blend percentages matter. A yarn containing 10% wool will not behave like one containing 80% wool just because both can be described as “wool blend.” Read the full composition and judge the fabric you actually need.

A reliable process

Choose yarn in this order

Fiber is one decision inside a bigger project system. Using this order keeps it connected to fit, quantity and the pattern rather than choosing from a fiber name alone.

  1. 01
    Start with the project or pattern.

    Identify the intended fabric, finished size and care requirements.

  2. 02
    Match the yarn weight.

    Use the stated 0–7 category or gauge as the starting thickness.

  3. 03
    Choose fiber behavior.

    Decide whether spring, stitch definition, warmth, drape or halo matters most.

  4. 04
    Check meterage and quantity.

    Compare metres per ball and calculate the total project requirement.

  5. 05
    Swatch when the result needs to fit.

    Gauge and fabric feel tell you more than the label alone.

Continue planning

Take the fiber choice into the rest of the project.

Yarn fiber FAQs

Common fiber questions

Is cotton yarn better than acrylic?

Neither is universally better. Cotton is typically smoother, more absorbent and less elastic; acrylic offers a very broad range of constructions and is often easy-care. Choose according to the fabric, care and project requirements rather than the fiber name alone.

Is wool warmer than acrylic?

Wool is valued for insulation and moisture management, while acrylic can also make warm fabrics. Warmth depends on more than fiber: yarn thickness, fabric density, construction and the specific blend all matter.

Which fiber is best for amigurumi?

Smooth cotton and cotton blends are popular starting points because they make stitches easy to see. Plush polyester/chenille yarn creates a very different fuzzy finish for larger soft toys. Use the Amigurumi guide to compare those two approaches.

Can I substitute a wool yarn with cotton?

Sometimes, but it is not a like-for-like fiber substitution. Cotton usually has less spring and can produce a heavier, less elastic fabric. Match the yarn weight and gauge, then assess the swatch and finished measurements before committing.

Are blended yarns lower quality?

No. Blends are often designed to combine useful properties from multiple fibers. Quality and suitability depend on the actual yarn construction, blend percentages and project requirements.

Find yarn another way

Start with what you already know.

Each route narrows Yarn Park’s Turkish yarn catalog from a different starting point: the project, yarn weight, fiber, or yarn name.