Merino Wool vs Superwash Merino: What's the Difference for Knitting and Crochet?

Quick Answer

Merino wool is prized for its natural softness, breathability, and warmth, but it requires gentle hand washing. Superwash merino is treated so it can be machine washed and dried, making it more convenient for everyday garments. Choose regular merino for delicate, hand-wash-only items and superwash for projects you'll wear and wash often.

When you're picking yarn for a new sweater, hat, or scarf, the choice between merino and superwash merino can feel confusing. Both come from the same breed of sheep, but the way they're processed changes how they behave in your hands and in the wash. Understanding these differences helps you choose the right yarn for your project and care for it properly.

In this comparison, we'll break down what sets merino and superwash merino apart, including feel, care, and durability. We'll also look at how these yarns work for knitting and crochet, so you can make an informed decision before you cast on or pick up your hook.

What Is Merino Wool?

Merino wool comes from Merino sheep, known for producing exceptionally fine and soft fibers. Unlike coarser wools that can feel itchy, merino is gentle against the skin, making it a favorite for garments worn directly on the body. It's also breathable and naturally regulates temperature, keeping you warm in winter and cool in milder weather.

In its natural state, merino wool has a slightly scaled surface. These scales can cause the fibers to cling together when exposed to heat, moisture, and agitation, leading to shrinkage and felting. This is why regular merino yarn typically requires hand washing in cold water and laying flat to dry.

• Hand wash in cold water with a gentle wool wash to preserve the fiber.
• Lay flat to dry to avoid stretching or felting.
• Store folded, not hung, to maintain shape.

What Is Superwash Merino?

Superwash merino wool has been treated to remove or smooth the scales on the fiber surface, often with a polymer coating. This process prevents felting and shrinkage, allowing the yarn to be machine washed and dried. The result is a more durable, low-maintenance wool that's perfect for items you'll wear and wash frequently.

The superwash treatment does change the hand feel slightly. Some knitters find superwash merino a bit slicker or less 'wooly' than regular merino. It also tends to drape differently, which can be an advantage for garments that need to flow, but it may not hold its shape as firmly for structured designs.

• Machine wash on a gentle cycle in cold water.
• Tumble dry on low heat, or lay flat to be extra safe.
• Check the yarn label for specific care instructions, as treatments can vary.

Key Differences at a Glance

The main differences between merino and superwash merino come down to feel, care, and performance. Regular merino has a more traditional wool texture and requires hand washing, while superwash is smoother, machine-washable, and more resistant to felting. Superwash yarn also tends to be more durable in high-wear areas, making it a good choice for socks and baby clothes.

However, superwash merino can grow or stretch more than regular merino, especially when wet. This is important to keep in mind for garments that need to hold their shape, like fitted sweaters or structured cardigans. Regular merino, on the other hand, has more 'memory' and will bounce back to its original shape better.

• For garments that need to hold shape, regular merino may be a better choice.
• For socks, hats, and everyday wear, superwash merino offers easy care.
• Test your gauge and block your swatch to see how each yarn behaves.

Trade-Offs to Consider

• Softness vs. Convenience: Regular merino has a more natural, 'wooly' softness, while superwash can feel slightly smoother or slicker. If you prioritize the authentic wool feel, choose regular merino. If you want easy care, superwash is the way to go. Decide what matters more: the traditional hand feel or the convenience of machine washing.
• Shape Retention vs. Drape: Regular merino holds its shape better and resists stretching, making it ideal for structured garments. Superwash merino drapes more fluidly, which is lovely for flowing shawls and loose cardigans, but it can grow with wear. Match the yarn to the project's needs: structure or drape.
• Care Effort vs. Durability: Superwash merino is more durable in high-friction areas and can be machine washed, saving time and effort. Regular merino requires gentle hand washing, but it can last just as long if cared for properly. If you're knitting socks or baby items, superwash is a practical choice. For a delicate heirloom piece, regular merino may be worth the extra care.

Merino Yarn Patterns to Try

• Lazy Days Infinity Scarf (Crochet): This pattern uses any worsted #4 yarn and recommends 2 skeins of Color Theory yarn with a 7 mm hook. It's a quick, relaxing make suitable for a weekend. An infinity scarf is a great first project for testing merino or superwash merino. The drape and softness of merino will make the scarf feel luxurious, and you can compare how each yarn behaves in a simple, repetitive stitch.
• Go Your Own Way Cardigan (Crochet): This granny square cardigan uses the same gradating yarn for all blocks, with a YouTube tutorial showing how to make the blocks, join them, and create the bandings. Cardigans are worn often and may need frequent washing. Superwash merino would be a practical choice for this project, as it can handle machine washing, while the drape of superwash will complement the flowy granny square design.

Which Should You Choose?

Best For

• Knitters and crocheters who want a low-maintenance yarn for everyday garments like socks, hats, and baby clothes.
• Projects that will be washed frequently, such as cardigans and children's wear.

Not For

• Structured garments that need to hold their shape perfectly, where regular merino's memory is an advantage.
• Projects where you want the traditional, slightly 'toothy' wool feel, as superwash can feel slicker.

Both merino and superwash merino are excellent choices for knitting and crochet, each with its own strengths. Regular merino offers natural softness and shape retention, while superwash provides convenience and durability. Consider your project's needs and your care preferences to make the right pick. Whichever you choose, you'll enjoy the luxury of merino wool in your handmade creations.