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How to choose the right ball of yarn for your project

Choosing the perfect ball of yarn determines the texture, drape, warmth, and durability of your knitting. In this guide, we'll help you decide confidently—and buy online without hesitation—based on your project, skill level, and the season.

▸ Table of Contents
  1. Define your project
  2. Quick guide to fibers
  3. Thread thickness and needles
  4. The color and finish
  5. Performance and sample
  6. Care and maintenance
  7. Get inspired before you decide
  8. FAQ for buying online without doubts

1. Define the type of project

Knitting a winter scarf isn't the same as knitting a summer top. Ask yourself: What are you knitting? Do you want it warm or light? With body or a soft drape?

  • Sweaters, hats, scarves : wool or acrylic blends.
  • Tops, amigurumis, summer children's clothing : cotton and natural fibers.
  • Bags, baskets, decoration : rag or macramé rope for structure.

2. Quick guide to fibers

Fiber type Characteristics Ideal for
Wool Warm, stretchy, and breathable. Great recovery. Sweaters, scarves, hats.
Acrylic Soft, easy to wash, itch-free. Very practical. Daily use and starter projects.
Cotton Fresh, resistant, defined. It's not hot. Tops, amigurumis, baby.
Cotton-wool blends Balance between lightness and warmth. In between seasons, versatile garments.
Trapillo Firm, thick, regular and light. Baskets, bags, rugs.
Mohair / Alpaca Light, very warm, soft halo. Delicate shawls and capes.
Idealium Tip: If you're hesitating between two fibers, consider the user experience (warmth, softness, weight) and the care you're willing to give (hand wash vs. machine wash).

3. Thread thickness and needles

The thickness determines the stitch size and knitting time. The thicker the thickness, the faster you go, with a more rustic finish.

Thickness Guide needle Typical projects
Lace / Fingering 2 – 3.5 mm Shawls, light tops
Sport / DK 3.5 – 4.5 mm Mid-season clothing
Worsted / Aran 4.5 – 6 mm Sweaters, scarves
Bulky / Super Bulky 7 – 12 mm Blankets, deco XL
Always use a swatch: Our patterns indicate the swatch and needle. Idealium patterns recommend a needle size: adjust the tension (looser/tighter) to match the swatch.

4. Color and finish

  • Neutrals and light colors : enhance texture; perfect if you're just starting out.
  • Gradients and shades : visual effect without changing the thread (e.g. soft gradients ).
  • Intense : personality and energy.
Always check the dye batch and buy an extra skein from the same batch if your project is large.

5. Yield and sample: calculate how many balls

On each product page, you'll see the yardage/weight , the 10x10 scale , and, where applicable, the estimated yield (stitches per ball). This allows you to estimate the number of balls you'll need.

  1. Identify the pattern swatch (stitches and rows/10×10).
  2. Check the ball length and performance (if indicated).
  3. Calculate by size and add +1 safety ball if you are between sizes or knit more loosely.

You can also read our article How Much Wool Do I Need for...?

Are you missing one at the end? Write to us and we'll help you locate the same batch if it's in stock. We can also advise you on compatible alternatives .

6. Care and maintenance

The longevity of the garment depends on washing and drying:

  • Wool and delicate blends : hand wash cold, dry flat.
  • Acrylic and synthetics : easier to care for, usually allow gentle washing.
  • Cotton : durable; avoid twisting, dry flat to prevent sagging.

At Idealium, each sheet includes its Care Guide to keep your garment in perfect condition.

7. Get inspired before you decide

Seeing the ball of yarn in action helps you choose. Visit:

FAQ for buying online without doubts

How do I know if it's itchy? The product information sheet indicates softness and recommended use (baby, neck, skin-to-skin contact). If you have sensitive skin, choose soft merino wool, silky-touch acrylic blends, or cotton.

Are the colors accurate? We take great care with the photography, but screens vary. If you're unsure between two shades, write to us and we'll send you a comparison photo in natural light.

How many balls should I buy? Use the swatch/meter guide and add an extra ball if your size is loose, you knit loosely, or you're lengthening the sleeves/body.

What about the dye batch? Buy everything at once. If you run out, we'll try to get the same batch ; we'll advise you on the transition if we don't have one.

What if I don't get it right? Contact us via WhatsApp or email before purchasing: we'll suggest 2–3 options that match your pattern and style.

✨ Find your ideal ball of yarn at Idealium

Browse by fiber, thickness, and season. If you have any questions, we'll help you via WhatsApp.

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How to choose the right yarn for your project online

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