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Is wool yarn machine washable?

Published in Wool Care 2 mins read

Whether wool yarn is machine washable depends on the type of wool.

While many people associate wool with hand washing, some wool yarns, particularly those labeled "superwash," can be machine washed. Traditional wool yarns, however, should be hand washed to prevent felting and shrinking.

Understanding Wool and Washability

The key difference lies in the treatment of the wool fibers.

  • Regular Wool: Has scales on its fibers that interlock when agitated in water, leading to felting and shrinkage.
  • Superwash Wool: Undergoes a process (typically involving chemicals or a polymer coating) to remove or smooth down these scales, making the fibers less likely to felt. Merino wool is often superwash.

How to Determine if Your Wool is Machine Washable

  1. Check the Yarn Label: This is the most reliable way to determine washability. Look for terms like "superwash," "machine washable," or specific washing instructions.

  2. Consider the Fiber Content: Superwash merino is a common type of machine-washable wool.

Machine Washing Superwash Wool: Best Practices

If your wool yarn is labeled as machine washable, follow these tips for the best results:

  • Use a Gentle Cycle: Select the delicate or gentle cycle on your washing machine.
  • Use Cold Water: Hot water can still cause some shrinkage, even with superwash wool.
  • Use a Wool-Specific Detergent: Avoid harsh detergents or bleach. Use a detergent formulated for wool or delicate fabrics.
  • Avoid Fabric Softener: Fabric softener can damage wool fibers.
  • Wash With Similar Items: Avoid washing wool with items that have zippers or rough textures that could cause abrasion.
  • Dry Flat: Do not put wool yarn items in the dryer, even if the yarn is superwash. Lay them flat on a clean surface or drying rack to air dry. Tumble drying can cause shrinkage and felting.

What if the Label is Missing?

If you don't have the yarn label, it's generally safest to hand wash the item to prevent damage. If you are feeling adventurous and have a small amount of yarn left, test a swatch by machine washing it before washing the entire garment.

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