What is superwash wool?

Superwash wool is produced using two different methods – the chlorination method and the polymer‑coating method. Both processes remove or neutralize the wool scales, so the wool no longer felts and becomes machine‑washable.

How is superwash wool made?

The production of superwash wool involves two main processes that change the surface of the wool and stabilize the fibers. This allows the wool to remain elastic, soft, and resistant to felting even when washed in a washing machine.
 

1. Chlorination method (traditional superwash treatment)
 

What is it?

The chlorination method is a process in which the surface of wool fibers is treated with chlorine or chlorine‑based solutions. This treatment removes or “scrapes off” the natural wool scales that cause felting.

How does it work?

• The wool is immersed in a chlorine solution.
• The scales on the surface of the fibers soften and peel off.
• The fibers become smoother and no longer catch on each other.

Advantages:

• Very effectively prevents felting.
• The yarn becomes smoother and easier to knit.

Disadvantages:

• The process is less environmentally friendly due to the use of chlorine.
• It may reduce the natural “loft” and texture of the wool.
   

2. Polymer‑coating method (modern superwash treatment)

What is it?

This is a process in which the surface of the wool is covered with a thin layer of polymers. This layer “locks” the fibers and prevents them from catching on each other.

How does it work?

• The wool is treated with special resin or polymer solutions.
• A thin, smooth film forms on each fiber.
• The fibers become resistant to friction and felting.

Advantages:

• A more controlled and gentler process than chlorination.
• The elasticity and softness of the wool are preserved.
• Dyes absorb better and remain vibrant.

Disadvantages:

• Polymers may be less environmentally friendly.
• The yarn may be more slippery when knitting.

Why are these methods important for knitters?

Both superwash production methods allow the wool to remain:

• resistant to felting,
• machine‑washable,
• elastic and soft,
• suitable for everyday knitwear.

Therefore, superwash wool is especially popular for knitting baby clothes, socks, sweaters, and accessories that need to be washed frequently.

Conclusion: Superwash wool is produced using two methods – chlorination and polymer coating. Both processes remove or neutralize the wool scales, making the wool resistant to felting and suitable for machine washing. This technology allows the wool to retain its softness, elasticity, and color vibrancy, making superwash wool one of the most popular choices in the knitting community.