What is cashmere? the fiber, the grades, and the honest price

What is cashmere? It is the fine, soft undercoat combed from cashmere goats that live in cold, high-altitude regions. The animals grow this downy layer to survive brutal winters. Mills separate it from the coarse outer guard hairs, then spin it into yarn prized for being warm, light, and unusually soft.

The goat grows two coats. The outer layer, called guard hair, is thick, straight, and protective. The inner layer, the down, is what becomes cashmere. A step called dehairing mechanically pulls the two apart, and the coarse guard hair is removed. Because the down is so fine, it traps air efficiently, which is why a thin cashmere sweater can feel warmer than a bulkier one made from sheep's wool.

In the United States the word is not just marketing. The federal Wool Products Labeling Act sets a legal definition: cashmere must consist of the fine dehaired undercoat of a cashmere goat, with an average fiber diameter no greater than 19 microns and no more than 3 percent of fibers exceeding 30 microns. For reference, a human hair is typically 50 to 100 microns, so this is very fine stuff. Fiber that misses the spec has to be labeled wool.

Where cashmere comes from

Most cashmere starts in Asia. China is the largest producer, followed by Mongolia, with meaningful output from Afghanistan, Iran, Turkey, and Kyrgyzstan. According to figures compiled on Wikipedia from industry data, China produced roughly 19,200 metric tons of raw cashmere in 2016 and Mongolia about 8,900 tons. Global raw production runs somewhere between 15,000 and 20,000 tons a year, and once the guard hair and impurities are removed, only around 6,500 tons of pure cashmere remain.

The fiber is usually gathered in spring, when the goats naturally molt. The gentlest method is hand-combing, which can take up to two weeks per herd and does not harm the animal. Faster shearing is also used, but it tends to cut in more guard hair and shorter fibers, which lowers quality.

Micron, ply, and length: what really sets quality

Three measurable things drive how good a piece of cashmere is, and none of them is the letter on a hangtag.

Micron is fiber diameter. The finest cashmere measures around 14 to 15 microns, which is where softness and luxury live. Coarser fiber nearer the 19-micron legal ceiling still counts as cashmere but feels less soft and pills more. Small differences matter a lot, which is why finer grades command steep premiums at the mill.

Staple length is how long each fiber is. Longer fibers, roughly 34 millimeters and up, stay locked in the yarn and resist pilling. Short fibers work loose, which is what produces those little balls on a cheap sweater.

Ply is the number of single strands twisted together. Two-ply is the common benchmark for sweaters. Single-ply is lighter but more fragile, and higher plies make a denser, more structured fabric. Ply describes construction, not fineness, so more ply is not automatically better. A sturdy two-ply of fine, long fiber beats a flimsy garment every time.

You will also see Grade A, B, and C everywhere. Treat it with caution. It is an informal industry shorthand, not a government or single-body certification, so the letter alone guarantees nothing. Ask for the actual micron and ply instead.

Why cashmere costs so much

Cashmere is expensive because the supply is tiny and the labor is intense. Each goat yields only about 150 grams of down a year, and dehairing removes a large share of that. Depending on yarn weight, a single adult sweater can take the usable output of several goats. Combing by hand, sorting, and dehairing all add cost before a thread is ever spun. Scarcity plus slow, skilled processing is the honest reason for the price, not magic.

How to tell good cashmere from bad or fake

A few checks help. Touch it. Real, fine cashmere feels soft and dry, not slick or squeaky, which can signal heavy chemical softening meant to disguise coarse fiber. Stretch the knit gently and let go, and good cashmere springs back rather than staying distorted. Rub the surface, and if fibers pill or shed heavily right away, the staple length is probably short.

Read the label for fiber content and, ideally, micron and ply. Be skeptical of a 100 percent cashmere sweater sold at a fast-fashion price, because the math on yield and labor makes a genuinely cheap one unlikely. Blends with wool or silk are not frauds, but they should be labeled as blends. If you want a definitive answer, a burn test on a loose thread smells like burning hair and leaves a brittle ash for real animal fiber, while synthetics melt into a hard bead.

The ethics and sustainability questions

Cashmere's boom has a cost. Rising demand pushed herd sizes up, and overgrazing has degraded large areas of grassland. On the Mongolian side, reporting cited by Wikipedia says overgrazing has degraded about 65 percent of grasslands, with goats' sharp hooves and close grazing especially hard on fragile soil. Animal welfare is a separate concern, since combing is gentle but not every operation is careful.

Standards exist to push the industry forward. The Sustainable Fibre Alliance, a nonprofit founded in 2015, runs an Animal Fibre Standard built on principles covering land management, decent work, biodiversity, animal welfare, and fiber quality. It says it now reaches around 160,000 herders across Mongolia and China. Certification is still far from universal, so if ethics matter to you, look for a named standard rather than a vague sustainable claim.

How to care for cashmere

Cashmere lasts for years if you treat it gently. Hand-wash or use a wool cycle in cool water with a mild detergent, never hot water, which can shrink and felt the fibers. Do not wring it. Press out the water, reshape it flat, and dry it on a towel away from heat and direct sun. Store it folded, not hung, so the shoulders do not stretch. A fabric comb or cashmere comb removes early pills and actually improves how the surface looks over time. Give a favorite piece a day of rest between wears so the fibers can recover.