Merino Nylon vs Superwash Merino: What’s the Difference?

Two Popular Sock Yarn Blends — But Which Is Right for You?

If you’ve been browsing sock yarns, you’ve probably come across two common fibre compositions: merino nylon blends (typically 75% merino / 25% nylon) and superwash merino. Both are popular for hand-knitted and crocheted socks, but they behave quite differently. Here’s what you need to know.

What Is Merino Nylon Sock Yarn?

Merino nylon is a blend of fine merino wool and synthetic nylon. The nylon — usually around 20% — adds significant durability to the naturally soft merino, making it ideal for socks that take a lot of wear.

Key characteristics:

• Durability: Nylon reinforces the heel and toe areas, extending the life of your socks considerably
• Softness: Merino is one of the finest wool fibres, with a micron count low enough to wear next to skin without itching
• Elasticity: Good natural stretch and memory, so socks hold their shape
• Care: Gentle machine wash or hand wash recommended; check the ball band
• Feel: Slightly more structured than pure merino — the nylon gives a subtle firmness

What Is Superwash Merino?

Superwash merino is merino wool that has been treated to remove the microscopic scales on each fibre. These scales are what cause wool to felt when agitated in warm water — so removing them makes the yarn machine washable and more resistant to shrinking.

Key characteristics:

• Machine washability: More reliably machine washable than untreated merino
• Softness: Very soft, with a slightly silkier feel than untreated merino due to the scale removal
• Drape: Tends to have more drape and less memory than merino nylon — great for shawls, but socks may stretch out more with wear
• Durability: Without nylon, pure superwash merino socks may wear through faster at the heel and toe
• Environmental note: The superwash treatment uses chemicals; some knitters prefer untreated or nylon-blend yarns for this reason

Which Should You Choose for Socks?

For socks that will be worn regularly and washed frequently, a merino nylon blend is generally the more practical choice — the nylon adds the durability that pure wool lacks. If you’re knitting socks as a special gift or for occasional wear, superwash merino is a lovely option for its silky softness.

At Mothy and the Squid, our sock yarn is a merino nylon blend, hand-dyed in small batches in the UK. The nylon content means your finished socks will stand up to real-world wear, while the merino keeps them beautifully soft against your skin.

A Quick Comparison

Browse Our Merino Nylon Sock Yarns

All of our sock yarns are hand-dyed in small batches, with colourways inspired by nature, seasons, and the world around us. Find your next skein below.