Definition
Superwash wool is a natural wool that has been chemically treated to remove its tendency to felt and shrink during washing. This treatment allows for machine washing in lukewarm water without the garment losing its shape, unlike untreated wool, which shrinks or damages easily. It is a practical solution that retains the natural properties of wool—such as warmth, elasticity, and durability—while simplifying the care of the finished knit piece.
Usage Context
In knitting, superwash wool is the go-to choice for those seeking easy-care creations, particularly for children’s clothing or items intended for frequent daily use. Unlike traditional wool, which requires hand washing or a specialized wool cycle, superwash can withstand a standard wash.
This treatment is especially valued for sweaters, socks, and baby blankets, where ease of maintenance is a priority. Manufacturers explicitly label yarn as “superwash” to justify a price point that is often slightly higher than standard wool, but typically lower than premium options like untreated merino.
Key Takeaways
- Prevents felting: Natural wool fibers are covered in microscopic scales; the superwash treatment smooths these scales to prevent them from interlocking and thickening during washing.
- Machine washable: Generally safe at 30-40°C (86-104°F) on a gentle cycle with a low spin.
- Retains wool’s benefits: Thermal insulation, breathability, and elasticity remain intact.
- May slightly alter the texture: Some knitters report a slight loss of “loft” (bounce) or a different feel compared to raw, untreated wool.
- Mid-range pricing: More accessible than high-end virgin wool, but slightly more expensive than standard untreated wool.
Related Terms
Merino wool — A fine wool from Merino sheep, prized for its softness; it is frequently offered in a superwash version to combine practicality with high quality.
Wool care — The set of recommended practices for washing and preserving wool garments; superwash significantly simplifies these steps compared to traditional wool.
Treated wool — A general category including any wool subjected to chemical or physical processes (such as superwash, special dyes, or anti-pilling treatments) to modify its properties.
Washable wool — A generic term for wool that can be machine washed; superwash is the most common and reliable form of washable wool.
FAQ
Q: Does superwash wool really have zero shrinkage?
A: Not entirely. A slight shrinkage (2-5%) can still occur, especially if the water is too hot or the cycle is too aggressive. Following the instructions (30-40°C, delicate cycle) minimizes this risk. We recommend washing a swatch first before washing a completed garment.
Q: Why is superwash wool more expensive?
A: The chemical treatment (using resins or polymers) adds to the production cost. This price increase is offset by the ease of maintenance: there is no need for specialized wool detergents or the time-consuming process of hand washing.
Q: Can you dye superwash wool?
A: Yes, although the treatment can slightly reduce the absorption of natural dyes. Synthetic dyes generally adhere well. Always check the yarn supplier’s recommendations before dyeing.