How Is Cashmere Yarn Graded? Understanding Quality Tiers and Fiber Standards
How Cashmere Yarn Is Graded
Cashmere grading comes down to four measurable factors: fiber diameter (micron count), staple length, color and cleanliness, and how much coarse guard hair remains after processing. Together these determine which quality tier — A, B, or C — a batch of fiber is assigned to before it's spun into yarn.
This matters more than most shoppers realize, because two sweaters both labeled "100% cashmere" can perform very differently depending entirely on the grade of fiber used. For background on what cashmere is in the first place, see what is a cashmere sweater.
What Sets Cashmere Apart From Other Fibers
Cashmere's defining trait is fiber fineness — it grows from the goat's undercoat specifically to trap warmth without adding bulk, which is why the same weight of cashmere insulates far better than an equivalent weight of sheep's wool. But because it's a natural fiber, no two harvests are perfectly identical, which is exactly why a formal grading system exists.
What Determines Cashmere Quality
Fiber diameter (micron count): the single biggest factor in perceived softness. Finer fiber means a smoother hand feel and less prickle against skin.
Staple length: longer fibers spin into smoother, stronger yarn with fewer loose ends poking out — which directly reduces pilling.
Fiber purity: the percentage of coarse guard hair left in the batch after de-hairing. Cleaner batches with less guard hair grade higher.
Color: natural white and light fiber is considered most valuable because it dyes most evenly and consistently; darker natural fiber is harder to dye to bright or pastel shades.
Grade A vs. Grade B vs. Grade C
| Grade | Micron Range | Fiber Length | Softness | Durability | Typical Use |
|---|---|---|---|---|---|
| Grade A | ~14–15.5 microns | 36mm+ | Exceptional | High, pills less | Premium sweaters, scarves |
| Grade B | ~16–17.5 microns | 32–36mm | Good | Moderate | Mid-range knitwear |
| Grade C | ~18–19 microns | Under 32mm | Coarser | Lower, pills faster | Blended or budget pieces |
International Fiber Standards
Cashmere isn't regulated by one single global body, but several standards shape how it's tested and labeled: the IWTO (International Wool Textile Organisation) sets testing protocols used across the industry, EU textile regulations require accurate fiber content labeling, the US FTC enforces the Textile Fiber Products Identification Act around cashmere content claims, and China's GB/T standards set domestic grading benchmarks given the country's role as a major producer.
How Grading Affects Price
Grade A fiber costs significantly more to produce because so much raw material is discarded in de-hairing to isolate only the finest, longest strands. That scarcity carries straight through to retail price — a Grade A sweater will almost always cost more than a Grade C sweater of similar construction, and that price difference reflects real, measurable fiber quality rather than marketing.
How Grading Affects Softness, Warmth, and Pilling
Finer, longer fiber produces yarn with a smoother surface and fewer protruding fiber ends — this is what makes Grade A cashmere feel noticeably softer and resist pilling far longer than lower grades. Warmth is also affected: finer fibers pack more insulating air pockets per gram, so a Grade A garment can be lighter while still as warm as a heavier, lower-grade piece.
How Brands Label Quality
Ply count is one of the most common points of confusion — a higher ply number describes yarn thickness, not fiber grade. A 2-ply Grade A sweater can easily outperform a 4-ply Grade C sweater in softness and pilling resistance. Geographic claims like "Mongolian cashmere" are also worth reading carefully — origin can correlate with quality, but it isn't a grading guarantee on its own; the fiber still needs to be graded and processed properly.
Common Misconceptions
All cashmere is equally soft. Not true — softness varies significantly by grade, and the difference is obvious side by side.
Heavier always means better. A heavier knit can simply mean more yarn was used, not that the fiber itself is higher grade.
Pilling always means poor quality. Even Grade A cashmere can pill somewhat in high-friction areas; it's a matter of degree, not an on/off signal.
Price always equals quality. Price is a useful signal but not a guarantee — brand markup varies, so it pays to check fiber grade claims directly where a brand discloses them.
Buyer's Guide to Choosing Quality Cashmere Yarn
Ask for micron count if you're buying yarn directly — anything at or under 15.5 microns is genuine premium territory. Feel the yarn or fabric in person when possible; fineness and smoothness are easier to judge by touch than by any spec sheet. Check for disclosed sourcing and grading information, since brands confident in their fiber quality tend to be transparent about it. For finished garments, see our cashmere sweater guide and browse graded options in our shop.
Expert Tips for Working With Graded Cashmere Yarn
If you knit or work with cashmere yarn directly, use looser tension than you would with wool — cashmere has less elasticity and can distort under tight stitches. Handle Grade A yarn with clean, dry hands since the fine fiber picks up oils quickly. Store spun yarn the same way as finished garments: folded, clean, and away from moths, as detailed in our care guide.
Frequently Asked Questions
What is the best cashmere grade?
Grade A, with fiber typically measuring 14–15.5 microns, is considered the finest and softest.
Does grade affect how warm a sweater is?
Yes — finer fiber traps more air per gram, so higher grades can be lighter while staying just as warm.
Is Grade B cashmere still good quality?
Yes, Grade B is a solid mid-range option that balances softness, durability, and price well.
How can I check the grade of a cashmere sweater before buying?
Look for disclosed micron count on the label or brand's website, and feel the fabric for softness and density.
Does ply count indicate fiber grade?
No. Ply describes how many yarn strands are twisted together, not the underlying fiber quality.
Why does Grade C cashmere pill more?
Its shorter, coarser fibers have more loose ends exposed on the yarn surface, which catch and tangle into pills faster.
Is Mongolian cashmere always Grade A?
Not automatically — origin can correlate with quality, but the fiber still has to be graded and processed to earn a top tier.
What micron count should I look for in premium cashmere?
Around 14–15.5 microns is generally considered premium, Grade A territory.
Are there official global cashmere grading standards?
There's no single universal authority, but IWTO testing protocols, EU and FTC labeling rules, and China's GB/T standards all play a role.
Can two sweaters both labeled "100% cashmere" differ in quality?
Yes, significantly — the label confirms fiber type, not grade.
Does staple length matter as much as micron count?
Both matter — micron count drives softness, while staple length drives yarn strength and pilling resistance.
Is it worth paying more for Grade A cashmere?
For most people, yes — the difference in softness, pilling resistance, and longevity is noticeable in daily wear.