Wool, Cashmere & Knitwear: What’s the Difference?

If you’ve ever stood in a clothing store running your fingers along a rack of sweaters, wondering why one costs £30 and the next costs £300, you’re not alone. The world of knitwear is full of terms that get thrown around interchangeably — wool, cashmere, merino, lambswool — but each one describes something genuinely distinct. Understanding the difference isn’t just about sounding knowledgeable in a boutique. It helps you shop smarter, care for your clothes properly, and build a wardrobe that actually lasts.

Let’s break it all down.

What Is Wool?

Wool is the broad term for the natural fibre shorn from sheep, and it’s one of the oldest textiles in human history. Humans have been spinning and weaving wool for at least ten thousand years, and it remains one of the most widely used natural fibres in the world today.

At its core, wool is a protein fibre made primarily of keratin — the same protein found in human hair and nails. Each fibre is covered in microscopic scales, which is what gives wool its unique ability to felt when exposed to heat and agitation. Those same scales also create tiny air pockets that trap warmth, making wool a naturally excellent insulator.

But “wool” is a huge category. The type of sheep, the age of the animal, the region it comes from, and the part of the fleece used all have a dramatic impact on the quality, softness, and performance of the resulting fabric. A rough Shetland knit and a buttery soft Merino cardigan are both made from wool, but they sit at opposite ends of the comfort spectrum.

Types of Wool

Standard or generic wool typically comes from commercial breeds like Romney or Corriedale sheep. It’s durable, warm, and affordable, making it well-suited to outerwear, blankets, and hardwearing knitwear. It can feel scratchy against bare skin for some people, particularly those with sensitive skin.

Merino wool comes from Merino sheep, originally bred in Spain and now raised extensively in Australia and New Zealand. The fibres are much finer than standard wool — typically between 15 and 24 microns in diameter — which makes it noticeably softer and far less likely to cause irritation. Merino has become enormously popular for base layers and everyday knitwear because it combines warmth, softness, and natural moisture-wicking properties.

Lambswool is shorn from a young sheep during its first shearing, usually at around seven months of age. Because the fibre tip hasn’t yet been cut, it retains a naturally tapered end that makes it particularly soft against the skin. Lambswool has a slightly springy, elastic quality and is considered a step above standard wool in terms of softness and fineness.

Shetland wool comes from the native sheep of Scotland’s Shetland Islands and is known for its lightness, warmth, and slightly rougher texture. It’s the traditional fibre used for Fair Isle knitwear and is loved for its authenticity and heritage. It isn’t the choice for next-to-skin wear, but layered over a shirt or base layer it’s perfectly comfortable and incredibly hardwearing.

The Wool Lifecycle and Sustainability

One of the most compelling arguments for wool — any wool — is its environmental profile. Wool is a renewable, biodegradable fibre. Sheep are shorn annually, the fleece grows back, and at the end of a garment’s life, wool will break down naturally in the ground. Compare that to synthetic fibres like polyester or acrylic, which are derived from petroleum and can persist in the environment for hundreds of years.

That said, the sustainability of wool is not without nuance. Intensive sheep farming has environmental costs, and the welfare of animals varies enormously between producers. Certifications like the Responsible Wool Standard (RWS) and the ZQ Merino programme exist to give consumers confidence that the wool they’re buying comes from well-managed farms with high animal welfare standards.

What Is Cashmere?

Cashmere is not wool from sheep. That’s the first thing to understand. It’s the soft undercoat fibre combed from cashmere goats — primarily found in Mongolia, China, Afghanistan, Iran, and the Kashmir region of India and Pakistan. The name “cashmere” is derived from the old spelling of Kashmir, the region where European traders first encountered the luxuriously soft shawls made from this fibre in the eighteenth century.

What makes cashmere so special — and so expensive — is a combination of scarcity, fineness, and the extraordinary softness of the fibre itself. Cashmere fibres are extremely fine, typically measuring between 14 and 19 microns. For comparison, a human hair is around 70 microns wide. The finest cashmere can be barely perceptible against your skin.

Each cashmere goat produces only about 150 to 200 grams of the usable undercoat per year. A single sweater requires the yield of around three to five goats. Add the labour-intensive process of combing out the fibres by hand, separating the coarser guard hairs from the fine undercoat, washing, and processing — and you start to understand why a high-quality cashmere jumper commands a premium price.

Why Does Cashmere Price Vary So Much?

The range of cashmere prices in the market today is staggering. You can find a cashmere jumper on the high street for £30, and you can spend £500 on one from a heritage brand. Why such a difference?

Ply and fibre length are the starting point. Higher quality cashmere uses longer fibres — known as long staple cashmere — which results in a smoother, stronger fabric that pills less over time. Cheaper cashmere is often made from shorter fibres that create a fluffy, initially soft texture but begin to pill aggressively after just a few wears.

The grade of the raw fibre matters too. Grade A cashmere consists of the finest, longest fibres, typically from the neck region of the goat. Grade B and C fibres are coarser and shorter. Many budget cashmere garments blend Grade C fibre with other materials, or blend cashmere with sheep’s wool, viscose, or cotton to reduce costs.

The number of plies — meaning the number of individual yarn strands twisted together — also affects quality and warmth. A 2-ply cashmere is thicker and warmer than a single-ply, and is generally considered the baseline for a sweater that will wear well over time.

Origin matters too. Mongolian and Himalayan cashmere from high-altitude regions is often considered superior because the extreme cold causes the goats to develop exceptionally fine, dense undercoats. Chinese cashmere, which dominates the global market, varies widely in quality.

Caring for Cashmere

Cashmere requires more attention than many other fibres. The key rules are: hand wash in cool water with a gentle detergent or baby shampoo, press out (never wring) the water, and lay flat to dry. Hanging a wet cashmere garment will stretch it out of shape. Heat is the enemy — never tumble dry or iron directly.

Pilling is almost inevitable with cashmere, particularly in lower-quality pieces. A cashmere comb or fabric shaver can remove pills without damaging the garment, and doing this regularly will keep your knitwear looking fresh. Store cashmere folded, never on a hanger, and use cedar blocks or lavender sachets to deter moths, which are particularly attracted to animal fibres.

What Is Knitwear?

Knitwear describes the method of construction rather than the fibre itself. A garment is “knitwear” if it is made by interlocking loops of yarn — a technique that creates a stretchy, flexible fabric quite different from woven textiles. Both your most luxurious cashmere pullover and a basic cotton t-shirt use a knit construction, although one is a fine gauge hand-frame knit and the other is jersey fabric cut and sewn.

Understanding knitwear really means understanding gauge, construction method, and finishing — three things that dramatically affect how a garment looks, feels, and wears.

Gauge: The Key to Understanding Knitwear

Gauge refers to the number of stitches per inch (or per centimetre) in a knitted fabric. A high gauge — such as 18 or 20 gauge — means the knit is very fine and tight, producing a smooth, almost woven-looking fabric suited to fitted silhouettes and lightweight layering pieces. A low gauge — like 5 or 7 gauge — produces a chunkier, more open fabric with visible stitch texture, better suited to heavy sweaters and statement knitwear.

High-gauge knitwear tends to be more formal and dressier, while chunky low-gauge pieces are usually more casual. The fibre also interacts with gauge: cashmere is most commonly found in high gauges because its fineness allows for very tight knitting, while tweeds and Shetland wool suit lower gauges and chunkier constructions.

Fully Fashioned vs. Cut and Sewn

This is one of the most important distinctions in knitwear quality, and it’s something many shoppers never hear about.

Fully fashioned knitwear is made by knitting each individual panel of a garment to its final shape on the machine. The front, back, and sleeves are each shaped as they’re knitted, and then linked together by hand along a chain-link seam. You can identify a fully fashioned garment by the “fashion marks” — small rows of decorative decreases visible along the seams — and by the quality of the seam itself, which lies flat and smooth.

Cut and sewn knitwear is made differently. Large sheets of knitted fabric are produced and then cut to the required shapes before being sewn together, much like a regular woven fabric. This is faster and cheaper, but it wastes material, the cut edges can fray or ladder over time, and the seams tend to be bulkier and less comfortable.

For a fine gauge cashmere or merino jumper, fully fashioned construction is the gold standard and is worth paying a premium for. The garment will retain its shape better, feel more comfortable against the skin, and last significantly longer.

Hand Knitting vs. Machine Knitting

Hand-knitted garments occupy a category of their own. Genuinely hand-knitted pieces — made by a skilled artisan using needles and yarn — can take many hours to produce, which is reflected in their price. They often have slight irregularities that are a mark of their handmade origin rather than a defect, and they tend to be highly unique.

Most commercial knitwear today is produced on flat-bed knitting machines, which can range from industrial behemoths producing thousands of units a day to small-scale workshop machines used by independent knitwear designers for limited runs. Machine knitting is not inferior to hand knitting by default — the quality of the finished garment depends far more on the fibre, gauge, construction, and finishing than on whether human hands or a machine formed the loops.

Wool vs. Cashmere: How to Choose

So which should you choose? The honest answer is that it depends on what you need from a garment.

Cashmere wins on softness and luxurious feel. There is genuinely nothing quite like a fine cashmere sweater next to the skin — it’s warm without bulk, smooth, and has a gentle drape that few other fibres can match. If you want a slim-fitting, versatile knitwear piece you can wear next to the skin all day, quality cashmere is difficult to beat.

But wool — and particularly merino wool — wins on durability, performance, and value for money. A well-made Merino wool sweater will likely outlast a budget cashmere piece by years, pills far less, handles washing more forgivingly, and retains its shape better over time. Shetland and lambswool pieces, if properly cared for, can last decades. There’s a reason that vintage woollen knitwear from the 1950s and 60s still turns up in excellent condition in charity shops and vintage stores.

Price-to-quality ratio is also important to consider. A £250 cashmere sweater from a reputable brand using long-staple Grade A fibre is a genuinely wonderful investment. A £35 cashmere sweater from a fast-fashion retailer will probably look worn within a season. You may find that a £150 Merino or lambswool piece from a quality knitwear brand gives you better long-term value than cheap cashmere.

Other Fibres Worth Knowing

The world of fine knitwear extends beyond sheep’s wool and cashmere. A few other fibres deserve mention.

Alpaca fibre comes from the alpaca, a camelid native to South America. It’s naturally hypoallergenic, warmer than sheep’s wool by weight, and has a beautiful silky lustre. It lacks the natural elasticity of wool, which means alpaca knitwear tends to grow and stretch with wear, but many people with wool sensitivities find alpaca far more comfortable.

Angora is the fibre combed from Angora rabbits. It’s extremely soft and has a characteristic fluffy halo effect. It’s often blended with wool or cashmere to add softness and texture. Pure angora is quite delicate.

Qiviut is the incredibly rare undercoat of the musk ox, found primarily in the Arctic regions of Canada and Alaska. It’s significantly warmer and finer than cashmere and is one of the rarest textile fibres in the world. Garments made from qiviut are extremely expensive but extraordinarily soft and warm.

Vicuña fibre, from the wild vicuña of the Andes, is considered the finest and most expensive natural fibre in the world. It can only be harvested during the animal’s periodic chaku — a traditional herding and shearing ceremony — and each animal yields only about 250 grams of fibre every two to three years. A vicuña coat can cost tens of thousands of pounds.

How to Read a Knitwear Label

When you’re standing in a shop (or scrolling through a product page), a few things on the label will tell you a great deal about what you’re actually buying.

Fibre content is the most fundamental piece of information. Look for the percentage breakdown — a jumper labelled “70% wool, 30% acrylic” is very different from one that says “100% Merino wool.” Blends aren’t necessarily inferior, but know what you’re getting. A small percentage of nylon added to a sock yarn, for example, significantly improves durability with minimal effect on comfort.

Country of origin offers clues about provenance and production standards, though it’s not a guarantee of quality. Scotland, Italy (particularly the Biella and Prato regions), and Japan have strong reputations for fine knitwear production. “Made in Mongolia” on a cashmere piece is generally a positive sign.

Care instructions reveal something about the fibre quality. If a garment labelled as cashmere is machine-washable, it’s likely been treated with a chemical process that alters the fibre structure to reduce shrinkage. This can make the fibre coarser over time. Untreated cashmere should require hand washing.

Certifications and quality marks add confidence. Look for the Woolmark symbol (certifying 100% pure new wool), the RWS certification for responsibly sourced wool, or ZQ certification for Merino. For cashmere, the Cashmere and Camel Hair Manufacturers Institute (CCMI) label is a recognised quality marker.

Caring for Your Knitwear

The most expensive knitwear in the world will deteriorate quickly if mistreated, and a modestly priced wool jumper can last a lifetime with the right care. A few universal principles apply.

Wash infrequently. Natural fibres are naturally antibacterial and odour-resistant. A cashmere or wool sweater doesn’t need washing after every wear — airing it out overnight is often enough. Over-washing breaks down fibres and shortens garment life.

Use cool water and gentle products. Warm or hot water will felt most wool fibres, causing irreversible shrinkage. Use a specialist wool wash or a small amount of very mild detergent.

Dry flat. Never tumble dry natural knitwear. Lay pieces flat on a clean towel, gently reshape them to their original dimensions, and allow them to dry away from direct heat or sunlight.

Store folded. Hanging knitwear — even on a thick hanger — causes it to stretch over time. Fold pieces and store them in a drawer or on a shelf. Keep them protected from moths during warmer months with cedar or lavender.

Final Thoughts

Wool, cashmere, and knitwear each represent something distinct — a fibre, a fibre, and a construction method respectively — but together they form the foundation of some of the most enduring and beloved pieces in any wardrobe. The hierarchy isn’t as simple as “cashmere is best.” The best garment is the one made with quality materials,