Materials

Cashmere vs Wool: Is Cashmere Warmer, and Is a Cashmere Coat Worth It?

5 min read October 22, 2026

The short answer

Legally, yes: US law counts cashmere as a wool. It is the fine winter undercoat of the cashmere goat, averaging 19 microns or less, while ordinary wool is sheep's fleece. Cashmere is softer and holds more warmth per gram, so a cashmere coat can be lighter for the same warmth; sheep's wool is harder wearing and pills less. In a coat, the weight and density of the cloth matter more than the fibre's name. Always check the label's percentage: many "cashmere" coats are mostly wool.

Editorial photograph by Esra Afşar, The Good Old — Anemoia Vestiaire
Photograph by Esra Afşar

Cashmere is a kind of wool, in the legal sense: the fine winter undercoat of the cashmere goat, where ordinary wool is the fleece of a sheep. Fibre for fibre, cashmere is finer and softer and traps more air for its weight, so a cashmere coat can be lighter than a wool one and still feel as warm. Wool is harder wearing and pills less. For a coat, though, the weight and density of the cloth decide the warmth more than the name of the fibre does.

We sell both in our vintage cashmere and overcoat archives, and every listing names the fibre and its percentage. This comparison is written for coats rather than sweaters.

Is cashmere wool?

Yes, in law and in kind. The US Wool Products Labeling Act counts the hair of the cashmere goat as "wool", together with sheep's fleece. The FTC rules then set a stricter bar for the word itself. A label may only say "cashmere" when the fibre is the fine, dehaired undercoat of the cashmere goat, averages 19 microns or less, and contains no more than 3% by weight of fibres coarser than 30 microns.

So the useful question isn't "is cashmere wool?" but "cashmere or sheep's wool?". Both are animal hair made of the same protein. They differ in where they come from and how fine they are. A goat grows a coarse outer coat of guard hair and, beneath it, a soft down against the cold. Only that down is cashmere.

Is cashmere warmer than wool?

For its weight, usually yes. In a coat, not automatically.

A fabric keeps you warm by holding still air. The fibres themselves conduct heat far better than the air caught between them, so what matters is how much air a cloth traps and how well it holds it. Finer fibres make smaller gaps and hold more air per gram, which is why a light cashmere cloth can feel as warm as a heavier wool one. Textile studies on insulating materials find the same pattern: insulation rises as the fibre gets finer.

But thickness and density count for more than the fibre's name. A dense, heavy wool overcoating will outlast the cold better than a thin, loosely woven cashmere one, and wind matters too: a tight weave keeps moving air out. You will often read that cashmere is "eight times warmer" than wool. We have not found a measurement behind that number, so we don't repeat it.

In practice: if you want warmth without weight, cashmere is the better fibre. If you want the warmest coat for the money, choose a heavy wool cloth.

Cashmere vs wool at a glance

Cashmere Sheep's wool
Source Winter undercoat of the cashmere goat, combed or shorn in the spring moult, then dehaired Fleece shorn from sheep
Fineness 19 microns or finer on average by US law; most commercial cashmere is about 14–19 Wide range: merino is about 12–24 microns, and many coat wools are coarser
Feel Very soft, with a slight sheen and drape From soft (merino) to firm and dry (tweeds, loden)
Warmth More warmth per gram Warm through weight and density
Wear Pills where it rubs; softer cloths wear sooner at cuffs and pockets Harder wearing; holds its shape
Vintage coat price (our stock, Oct 2026) Pure cashmere coats: about €195–430 Wool coats: mostly €150–250; cashmere-and-wool blends mostly €155–250

Does cashmere pill?

Yes, and that's normal. Pills form when loose fibre ends work out of the yarn, tangle and roll into small balls where the cloth rubs. A study of cashmere knitwear found short fibres were the main cause, especially those under about 7.5 mm, ahead of yarn twist or fabric density. Cashmere is a short, very fine fibre, so it pills more readily than most sheep's wool.

On a coat, look first under the arms, at the cuffs, around the pockets and where a bag strap sits. Light pilling comes off with a fabric comb or a cashmere brush and doesn't mean the coat is worn out. Thin, shiny or bare patches in the same places do. Our guide to cleaning a cashmere coat covers brushing and storage.

Why is cashmere so expensive?

Because each goat gives so little. A cashmere goat yields only about 110–150 g (4–5 oz) of down a year, gathered in the spring moult by combing or shearing. The down then has to be separated from the coarse guard hair by a mechanical process called dehairing. Most of the world's supply comes from China and Mongolia, and the herd and the harvest change with the winters there.

Sheep's wool comes off in whole fleeces, from far larger flocks, with no dehairing. The gap in raw fibre cost is what you pay for in a new cashmere coat.

The blend trap: read the percentage

US rules require a fibre content label with each fibre's percentage, and "cashmere" may only be named with its share stated. That share can be small. Max Mara's 101801, often called a cashmere coat, is labelled 90% virgin wool and 10% cashmere. That's a fine coat, but mostly a wool one.

When you buy, vintage or new:

  • "100% cashmere" or "pure cashmere" is the whole thing.
  • "Cashmere and wool" means a blend: ask for the percentage, or look for it on the label in the side seam or inside pocket.
  • A fibre name in the title tells you what a coat is about, not what it is made of. The label is the only proof.

Is a cashmere coat worth it?

It depends on what you want from it. Choose wool for a coat you'll wear hard every day, in rain, with a bag on your shoulder: it is tougher and keeps its shape. Choose cashmere when you want the hand, the drape and warmth without bulk, and you're happy to brush it now and then.

Vintage changes the maths. New, even Max Mara's 101801, which is 90% wool, sells for about $4,490 on Max Mara's US site (October 2026), and pure cashmere coats from the big Italian houses cost more. In our archive the gap is small: in October 2026 our pure cashmere coats were about €195–430, against mostly €150–250 for wool and for cashmere-and-wool blends. Many were cut by Italian, German and Austrian makers from mill cloth such as Colombo, Piacenza or Lanificio del Casentino. A good vintage cashmere coat is one of the few places where the better fibre doesn't cost several times more.

Before you buy, check the label for the percentage, look for thinning under the arms and at the cuffs, and hold the cloth to the light for moth holes.

Common questions

Is cashmere a type of wool?

Yes. The US Wool Products Labeling Act defines wool as the fibre of sheep or the hair of the Angora or cashmere goat. Cashmere is the goat's fine undercoat; to be labelled cashmere in the US it must average 19 microns or less, with no more than 3% of fibres over 30 microns.

Is cashmere warmer than wool?

Per gram, usually yes: finer fibres trap more still air, so a lighter cashmere cloth can feel as warm as a heavier wool one. But a coat's warmth depends mostly on the thickness and density of the cloth, so a heavy wool overcoat can be warmer than a thin cashmere one. We have found no measurement behind the common "eight times warmer" claim.

Does cashmere pill more than wool?

Generally, yes. Pills form from short fibre ends working loose, and cashmere is a short, very fine fibre; a study of cashmere knitwear found fibres under about 7.5 mm were the main cause. Light pilling on a coat brushes off with a cashmere brush or fabric comb and is not a sign of a worn-out coat.

Why is cashmere more expensive than wool?

Each goat gives only about 110–150 g (4–5 oz) of down a year, harvested by combing or shearing in the spring moult, and it must then be mechanically dehaired to remove the coarse guard hair. Most supply comes from China and Mongolia. A sheep gives a whole fleece and needs no dehairing.

Is a 90% wool, 10% cashmere coat a cashmere coat?

Not really: it is a wool coat with some cashmere. US rules require each fibre's percentage on the label. Max Mara's 101801, often called a cashmere coat, is 90% virgin wool and 10% cashmere. Look for "100% cashmere" or "pure cashmere" if you want the whole thing.

Is a vintage cashmere coat worth it?

Often, yes, because vintage narrows the price gap. In our archive in October 2026, pure cashmere coats were about €195–430, against mostly €150–250 for wool coats. Check the label percentage, look for thinning under the arms and at the cuffs, and hold the cloth to the light for moth holes.

Keep reading

The Cashmere Story — Anemoia Vestiaire Material Notes The Cashmere StoryHow cashmere is made and graded, the houses that define it, and how to judge a vintage cashmere coat.Read the story →
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Every piece in the archive is one of a kind. When it is gone, there is no second one.

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