Superwash vs Non-Superwash: What It Means for Your Project
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You've probably seen the word "superwash" on a skein label a hundred times without ever quite knowing what it changes. It's not just a washing instruction. It affects how the yarn feels in your hands, how it behaves on the hook or needles, and how your finished piece holds up over the years. Here's what's actually going on, and how to pick the right one for your next project.
What does "superwash" actually mean?
Wool fibre is covered in microscopic scales, a bit like tiny overlapping shingles. Under heat, moisture, and agitation, those scales catch on each other and lock together. That's felting, and it's why a wool jumper can go into the wash looking fine and come out fit for a teddy bear.
Superwash treatment coats those scales in a thin polymer resin, or in some cases strips them back slightly, so they can't grab onto each other anymore. The result is wool that can go through a washing machine without felting.
Non-superwash wool, sometimes called "regular" or "untreated" wool, keeps those scales intact. It's wool in its most natural state, which comes with its own set of advantages.
Neither one is better across the board. They're just different tools, and knowing what each does well makes the choice a lot easier.
How they differ in the skein and on the needles
Superwash wool tends to feel a little more relaxed and silky, with more drape and less bounce. The resin coating smooths the fibre down, which is part of why superwash yarns often feel so soft straight out of the skein. It also tends to show stitch definition slightly differently, with a bit less of that crisp, springy pop you get from untreated wool.
Non-superwash wool keeps its natural elasticity. It has more bounce, more memory, and a tendency to hold its shape well. Cables and textured stitches often look a touch more defined, and colourwork tends to sit a little neater because the stitches aren't as prone to slipping around.
Neither behaves badly. They just knit or crochet up slightly differently, and once you've worked with both a few times you'll start to feel the difference before you even check the label.
Durability and wear
This is where the two really part ways.
Non-superwash wool is naturally more hard wearing. Those intact scales that cause felting are the same ones that help the fibre resist abrasion and hold together over years of wear. It's part of why traditional Fair Isle and Aran jumpers, the kind meant to last for decades, were almost always made from untreated wool.
Superwash wool, because the scales have been smoothed away, can be a little more prone to pilling and can grow slightly in length over time as the fibres relax with washing and wear. It's still a durable, hardworking yarn. It's just working with a slightly different set of trade-offs.
Which one for which project?
Socks
This is the one exception where superwash usually wins, purely for practicality. Socks get washed constantly, and being able to throw them in the machine without a second thought matters. Most of our sock / 4ply bases are superwash for exactly this reason, often blended with a bit of nylon for extra durability where the wool alone might wear thin.
Jumpers and cardigans
Both work well here, but it comes down to how you want to care for the finished piece and how much structure you want it to hold. Non-superwash gives you a garment with real memory and shape retention, ideal if you're after that classic, slightly rustic hand knit look. Superwash gives you an easier care garment with beautiful drape, which suits more relaxed, modern silhouettes.
Children's knitwear
Superwash is usually the practical choice. Kids' clothes get washed often and washed in a hurry, and not having to hand wash a jumper after a muddy afternoon is worth quite a lot.
Blankets and cushions
Non-superwash tends to hold up beautifully here, since blankets benefit from that extra durability and don't need frequent washing. That said, if it's a blanket for a baby or a well loved sofa throw that's going to see a lot of action, superwash makes life easier.
Colourwork and cables
Non-superwash is often the better pick. That extra bounce and stitch definition really lets cables pop and keeps colourwork stitches sitting neatly in place.
Quick reference
| Project | Better fit | Why |
|---|---|---|
| Socks | Superwash | Frequent washing, easy care |
| Jumpers, cardigans | Either | Depends on drape vs structure |
| Children's knitwear | Superwash | Practicality, frequent washing |
| Blankets, cushions | Non-superwash | Durability, less frequent washing |
| Cables, colourwork | Non-superwash | Stronger stitch definition |
| Heirloom pieces | Non-superwash | Longevity, traditional handle |
A note on caring for both
Even superwash wool benefits from a bit of gentleness. Machine washable doesn't mean indestructible, so a wool cycle with a mild detergent will keep colours and fibre in better condition for longer. Non-superwash wool should be hand washed in cool water with a wool wash, and laid flat to dry rather than hung, which stops it stretching out of shape.
Whichever you choose, avoid wringing. Press the water out gently instead, and let gravity and time do the rest.
So which should you choose?
Honestly, it depends on what you're making and how much washing it's going to see. If you want a fuss free finished object that can handle real life, superwash is a brilliant choice. If you're after that traditional, springy handle and don't mind a bit of extra care, non-superwash is hard to beat.
Most of us end up with a bit of both in our stash, reaching for whichever suits the project in front of us. That's really the whole point.
If you're not sure which of our bases is superwash treated, it's always listed in the product description, and we're always happy to answer a quick message if you're still deciding.
Blewbury Yarns is a small batch yarn UK indie dyer, making hand dyed yarn for knitting and crochet. Based in the UK, we ship across the United Kingdom.