What Does "Superwash" Actually Mean?
If you've been shopping for yarn for any length of time, you've probably seen the word "superwash" on labels and product listings. But what does it actually mean — and does it matter for your project?
Superwash is a treatment applied to wool (and other animal fibers) that removes or coats the microscopic scales on each fiber. Those scales are what cause wool to felt and shrink when exposed to heat and agitation. By treating the fiber, superwash wool becomes machine washable and much more resistant to felting.
How is Superwash Wool Made?
There are two main methods used to create superwash wool:
- Chlorine-Hercosett process — The fiber is treated with chlorine to strip the scales, then coated with a polymer resin. This is the most common commercial method and produces a very soft, slightly silky feel.
- Ozone or enzyme treatments — A more eco-friendly alternative that uses ozone or enzymes to modify the scales rather than stripping them entirely. Less common but growing in popularity.
The Benefits of Superwash Yarn
Superwash yarn has a lot going for it, especially for certain types of projects:
- Machine washable — The biggest selling point. Great for items that will be washed frequently, like baby garments, socks, and everyday wear.
- Soft and drapey — The treatment often makes the fiber feel smoother and gives finished fabric more drape.
- Takes dye beautifully — Superwash wool is particularly receptive to hand dyeing, which is why so many hand-dyed yarns use superwash bases. Colors tend to be vivid and even.
- Beginner-friendly — Less worry about accidental felting makes it a great choice for newer knitters and crocheters.
The Drawbacks of Superwash Yarn
No yarn is perfect for every situation. Here's where superwash can fall short:
- Less memory and elasticity — Superwash wool doesn't "bounce back" as readily as untreated wool, which can affect stitch definition in cables and textured patterns.
- Environmental considerations — The chlorine-Hercosett process uses chemicals and produces wastewater. If sustainability is important to you, look for yarns treated with eco-friendly methods or choose non-superwash.
- Can grow with washing — Because superwash fibers are more relaxed, finished items may stretch or grow slightly over time, especially in heavier weights.
When Should You Choose Superwash?
Superwash is an excellent choice when:
- You're making socks — they need frequent washing and superwash holds up beautifully.
- You're knitting or crocheting for babies or children — easy care is a must for gift items.
- You want vivid, saturated color — hand-dyed superwash bases are stunning.
- The recipient isn't confident about hand washing delicate fibers.
When Should You Choose Non-Superwash?
Non-superwash wool shines when:
- You're making colorwork or stranded knitting — the natural elasticity and memory of untreated wool gives better stitch definition.
- You want to felt intentionally — only non-superwash wool will felt.
- You're prioritizing sustainability and want to minimize chemical processing.
- You're making outerwear or structured garments that benefit from wool's natural resilience.
A Note on Our Hand-Dyed Yarns
At Imagination Gone Wild Fiber Co., we carry both superwash and non-superwash bases, and we always note the fiber content and care instructions on every skein. Not sure which is right for your project? Browse our collection — and don't hesitate to reach out with questions. We love helping you find the perfect yarn!