Material Comparison
Mongolian Cashmere vs Merino Wool: Which Is Warmer for Travel?
9 min read · written for Wildfool by hand
Cashmere is warmer per gram than merino — usually around 1.6 times warmer, not the seven-fold figure repeated by some retailers. But warmer-per-gram doesn't always mean warmer-for-you in a 12°C airport gate or on a thirty-minute walk to the train. Which fiber wins depends less on the spec sheet than on what the next twelve hours actually look like.
In sixty seconds
- Cashmere fiber averages 13.5-18 microns; superfine merino starts around 17.5 microns. The two cross at the edges, which is why a 17.5-micron merino sweater can feel surprisingly close to cashmere.
- Cashmere is warmer per gram because its crimp structure traps more air per square inch. A typical cashmere sweater runs 30-40 percent lighter than a comparable merino for similar warmth.
- Merino is more durable. Its longer staple length resists pilling and abrasion better; the fiber survives thousands more bend cycles than cashmere.
- Cashmere wins in cabin layers, evening wraps, and commuter scarves. Merino wins on hikes, in sweat-prone activities, and where temperature regulation matters more than peak warmth.
- Most fine commercial cashmere comes from Capra hircus goats raised on the Alashan plateau in Inner Mongolia, where winter temperatures regularly drop below -30°C — the cold is what drives the fine down.
Cashmere: Capra hircus down from the Alashan plateau
Cashmere is the down undercoat of Capra hircus, the domestic goat that originated in the high deserts of Central Asia. The animal grows two coats every winter — a coarse outer guard hair, and a fine inner down that protects against extreme cold. Each spring, the goats shed naturally, and herders comb the down out of the fleece by hand.
Not all Capra hircus goats produce cashmere of equal quality. Breed and climate both matter, and both have a geographic answer. The finest cashmere in commercial production comes from goats raised on the Alashan plateau in West Inner Mongolia — a high-altitude semi-desert where winter temperatures regularly drop below -30°C. The cold drives the goats to grow finer, longer down. Alashan cashmere typically measures 13.5 to 14.5 microns in diameter, with strand lengths of 34 to 38 millimeters. Some peak batches measure under 14 microns.
The industry grades cashmere primarily by fiber diameter:
- Grade A — 15.5 microns or finer. The softest down, harvested mostly from the goat's neck and underbelly. Higher cost, smaller yield per animal.
- Grade B — 16 to 18 microns. The range used in most quality cashmere garments.
- Grade C — 19 microns and above. Coarser, used in blends or lower-grade knitwear.
Mongolia and the Alashan region of China together account for the bulk of fine commercial cashmere. The label "Mongolian cashmere" can technically include either side of the border — the goats and the climate cross it.
Merino: a different animal, a wider grade range
Merino wool comes from a different animal entirely — the Merino sheep, a breed developed in Spain in the 12th to 15th centuries and exported worldwide from the 18th century onward. Today, Australia produces about 90 percent of the world's fine apparel wool, with concentrations in southern New South Wales, Victoria, and Tasmania, where the cooler highlands produce particularly fine fleece.
Unlike cashmere, the entire fleece of a Merino sheep is sheared once a year — typically in spring — yielding several kilograms of fiber per animal. A cashmere goat produces only a few hundred grams of usable down annually, which is part of the reason the two fibers exist at very different price points before any other variable enters the calculation.
Merino is graded along a wider micron range:
- Ultrafine (under 17.5 microns) — base layers, garments for sensitive skin
- Superfine (17.5-19.5 microns) — the "next-to-skin" range, soft and durable
- Fine (19.6-22.5 microns) — the most common range for sweaters and mid-layers
- Medium (22.6-29.5 microns) — outerwear, heavier knits
- Strong (30+ microns) — durability-first applications
All merino fleece sold at auction in Australia is objectively measured for fiber diameter, which keeps the grading consistent across mills. The crossover point matters: a 17.5-micron superfine merino sweater sits in the same diameter range as a 17.5-micron Grade B cashmere. They feel different — merino is more elastic, cashmere has more loft — but the softness gap closes at this end of the spectrum.
The warmth math, with fewer claims than usual
Wool's warmth doesn't come from the fiber itself. It comes from the air trapped between the fibers. The crimp — the natural wave along the length of each strand — keeps the fibers from lying flat against each other, and the resulting structure holds a volume of stationary air several times the volume of the fiber itself. Air is a poor conductor of heat. The more air a fabric traps, the slower body heat escapes through it.
Cashmere has higher crimp density and more loft per fiber than merino. The result on the spec sheet:
- Cashmere fiber is finer (13.5-18 microns vs 17.5-22.5 for typical merino).
- Cashmere fibers have more crimps per inch.
- A given weight of cashmere yarn holds more air than the same weight of merino.
The widely-repeated claim that cashmere is "seven to eight times warmer than wool" comes from informal comparisons that aren't apples-to-apples. The more conservative — and more useful — answer is closer to 1.5 to 1.7 times warmer per gram, depending on knit construction, ply, and finish.
A typical example: an 800-gram all-cashmere crew-neck offers similar warmth to a 1,300-gram all-merino crew-neck of comparable cut and knit gauge. The cashmere version feels less bulky on the shoulder; the merino version handles a sweat-prone walk without losing structure. Neither is wrong — they answer different questions.
The warmest fiber in your suitcase isn't always the right one for the morning. The right one is whichever fiber matches the next four hours.
Where each fiber actually shines
The right fiber depends on the situation more than on the spec sheet.
Cashmere wins:
- Cabin layers on long flights — light enough to fold into a seat-back pocket, warm enough to nap under
- Evening wraps over a thin top — adds warmth without changing the silhouette
- Commuter scarves on cold mornings — substantial warmth at almost no neck-bulk
- Indoor layering in heated buildings — soft enough that the friction against skin disappears
- Travel wardrobes where weight matters — half the gram-count for the same warmth output
Merino wins:
- Outdoor activity, especially with sweat — the fiber wicks moisture and dries faster than cashmere
- Hiking, walking, running — abrasion-resistant enough to survive backpack straps and repeated friction
- Temperature swings — merino regulates more actively, holding warmth in cold and venting in warm
- Frequent wash cycles — merino has more headroom for machine-washing (always check the label)
- Multi-day wear without washing — merino's natural antibacterial structure resists odor far better than cashmere
A common practical answer: pack one merino layer for the active day — the museum walk, the stadium queue, the unexpected hike — and one cashmere layer for the still hours — the dinner reservation, the long flight, the late café evening. Both fit in the same packing cube.
Care, pilling, and how each ages
Cashmere is the more delicate of the two, and the difference shows up most clearly in pilling.
Cashmere fibers are shorter than merino — typically 34-38mm in Alashan cashmere, versus 70-100mm or more in fine merino. Shorter staples produce a softer hand but a higher tendency for surface fuzz, especially in areas of friction: the underarm seam, the elbow, where a strap rests on a shoulder. The first season of wear is when a cashmere sweater pills the most; once the loose surface fibers shed off, pilling slows considerably.
Merino's longer staple resists abrasion better. The fiber tolerates being bent back on itself more than 20,000 times before breaking, where cashmere fibers often break after a few thousand bends. In practical terms, a merino sweater that gets daily wear lasts longer between pilling treatments and shows less scuff at the cuff and hem.
Both benefit from the same care basics. Hand-wash in cool water with a wool-specific detergent, lay flat to dry, store folded — never hung — and rotate between wears so the fiber recovers. A cashmere de-piller, used gently every few wears, keeps the surface clean.
The Wildfool cashmere: Inner Mongolia, mill direct
Wildfool's cashmere comes from the same Alashan plateau in Inner Mongolia that supplies most fine commercial cashmere worldwide. The fiber is 100 percent Capra hircus down, sourced direct from a mill in the region rather than through an intermediary in Italy or France.
The price difference, when the fiber meets a label that doesn't pass through a design-house markup, is what changes here. The mill is the mill. The goat is the goat. The cashmere coming off an Alashan plateau spring comb in 2026 is the same cashmere that, with a different label, sells at a heritage house up the supply chain.
The current Wildfool cashmere line lives at /collections/scarves. Sourced where it's made.
Frequently asked
Is cashmere always warmer than merino wool?
Per gram, yes — typically about 1.5 to 1.7 times warmer. But for the same total warmth, a thicker merino sweater can match a lighter cashmere one, and merino regulates temperature more actively across changing conditions. The right choice depends on whether you'd rather carry less or move more.
Is "Mongolian cashmere" different from "Inner Mongolian cashmere"?
Often the same fiber. The cashmere goat (Capra hircus) is raised across the Mongolian plateau, which spans both the country of Mongolia and the Inner Mongolia region of China. The Alashan area in Inner Mongolia produces some of the finest cashmere on the market. The label difference is geographic; the down behaves the same.
Will a merino sweater pill if I wear it daily?
Less than cashmere will. Merino's longer staple resists pilling better, and the higher abrasion resistance shows up in less wear at the cuffs and elbows. New merino can pill mildly during the first wash; well-made merino tends to settle by month two of regular wear.
Can I machine-wash either one?
Some merino sweaters are machine-washable on a cool wool cycle; the label is the authoritative source. Cashmere should be hand-washed in cool water with a gentle wool detergent and laid flat to dry. Either fiber, in the wrong wash setting, can felt — the fibers lock together and the garment shrinks irreversibly.
Why is cashmere so much more expensive than merino?
Two reasons. A merino sheep produces several kilograms of usable fleece per year. A cashmere goat produces only a few hundred grams of usable down. The yield gap is roughly ten to one by weight, and that's before any difference in mill, ply, or finish enters the calculation.
Cashmere is the fiber for stillness — the long flight, the long dinner, the long evening. Merino is the fiber for motion — the unfamiliar walk, the museum half-day, the morning that ends warmer than it started. Most travel wardrobes need a little of each.