Cashmere Grades Explained: What Your Label Isn't Telling You

The Micron Myth

Walk into any luxury boutique and you'll find cashmere sweaters ranging from £200 to £2,000, all claiming superior softness. The difference? Often a number you'll never see on the hang tag: micron count. This measurement—the diameter of each individual fibre—is the single most reliable indicator of cashmere grades quality, yet brands rarely advertise it. Fibres measuring 14-15.5 microns represent the finest grade, sourced from the underbelly of Mongolian or Himalayan goats during their first spring moult. Anything above 19 microns technically qualifies as cashmere under labelling laws, but the hand feel is worlds apart.

Brunello Cucinelli, for instance, sources exclusively from fibres under 15.5 microns and subjects each batch to a 14-step quality control process at their Solomeo atelier—one reason their signature ribbed crewnecks maintain structure season after season without pilling. Meanwhile, mass-market "100% cashmere" often blends grades, using coarser fibres (17-19 microns) that feel plush initially but degrade within a dozen wears. The label says cashmere. The longevity tells another story.

Ply, Gauge, and the Structure Question

Micron count addresses fibre quality, but ply and gauge determine how that fibre performs as fabric. Two-ply cashmere—two fine threads twisted together before knitting—offers durability without bulk, which is why it's the default for investment pieces. Single-ply feels lighter but stretches out faster, while four-ply and above venture into outerwear territory (think Loro Piana's Storm System coats).

Gauge refers to the tightness of the knit, measured in stitches per inch. A 12-gauge knit creates that classic, slightly relaxed hand you see in Brora's heritage styles, while 18-gauge and above produces a tighter, more refined surface—ideal for tailored silhouettes but less forgiving if the yarn quality falters. Here's where understanding cashmere grades quality becomes practical: lower-grade fibre in a tight gauge will pill aggressively because shorter, coarser fibres work their way to the surface. Higher-grade fibre in a looser gauge, conversely, drapes beautifully and ages into that coveted vintage softness.

What to look for on the label:

• Fibre length: Longer staple fibres (34-36mm) pill less than short fibres
• Origin specificity: "Mongolian cashmere" or "Hircus goat" signals transparency
• Ply construction: Two-ply balances luxury and longevity for most styles
• Finishing process: Stone-washing or enzyme treatments indicate attention to hand feel

The Price-to-Quality Calculus

So why does a Uniqlo cashmere crewneck cost £99 while The Row's version hovers around £1,200? Part of it is markup and brand cachet, certainly, but a significant portion reflects cashmere grades quality and manufacturing ethics. Budget cashmere typically sources from Chinese suppliers using blended grades (15-19 microns mixed), machine-sorted, and knitted at high speed. The result is serviceable but not heirloom.

Mid-tier brands like Éric Bompard occupy a sweet spot: they publish their micron counts (15-15.5), control the supply chain from Mongolian herders to their Parisian atelier, and price around £300-500 for classic styles. At the top end, houses like Loro Piana own farms, test every batch for fibre diameter and length, and employ hand-finishing techniques that justify the premium—provided you wear the piece enough to amortise the cost per wear.

The uncomfortable truth is that cashmere grades quality standards remain largely self-regulated. The Cashmere and Camel Hair Manufacturers Institute sets guidelines (maximum 19 microns, maximum 3% coarse fibres), but enforcement is patchy. Your best defence? Buy from brands that specify their sourcing, offer transparent care instructions, and stand behind their product with repair programmes. A label that simply reads "100% cashmere" with no further detail is a red flag, not a guarantee.

The Hand Test

Before you reach for your wallet, run the fabric between your fingers. Genuine high-grade cashmere has a cool, almost silky hand that never feels woolly or scratchy, even on bare skin. Gently tug a small section: it should spring back without distorting. Check the interior seams—sloppy finishing often correlates with rushed production and lower-grade materials. And if possible, examine the piece in natural light for evenness of colour; premium dyes penetrate finer fibres more uniformly, while cheaper cashmere can look mottled or fade unevenly.

The smartest approach to cashmere grades quality isn't always buying the most expensive piece in the shop. It's knowing what separates a £200 impulse purchase that pills by January from a £600 investment that improves with age—and recognising when a brand is charging for cachet rather than craftsmanship.