Build it once
Merino vs Cashmere: Microns, Pilling, and When $200 Is Worth It
Both are protein fibers. Merino is a sheep with bounce and odor control. Cashmere is a goat with more warmth per gram and a pilling problem you can see coming. Price tells you which one to wear hard.
Updated 22 Aug 2026 · 8 min read · merino vs cashmere
Microns, not marketing
A micron is a thousandth of a millimeter, and it is how wool fineness is sold. Merino clothing is usually 17–22 microns. Superfine merino sits under 18.5. Next-to-skin base layers from Icebreaker, Smartwool, and similar live at 17–19 and cost $70–110 for a long sleeve. Uniqlo’s merino crew is coarser, around the low 20s, $40–50, and that is still a real sweater.
Cashmere is the undercoat of a cashmere goat, combed, not shorn like a merino fleece. Grade-A cashmere is often 14–16 microns and 34mm+ staple. That number is why it feels colder to the hand (it isn’t) and warmer on the body (it is): more air trapped per gram, less itch. “Cashmere feel” polyester is none of this. If the hang tag will not say wool or cashmere as a percentage, it is a hand-feel claim, not a fiber.
| Merino | Cashmere | |
|---|---|---|
| Animal | Merino sheep | Cashmere goat (undercoat) |
| Typical microns | 17–22 | 14–19 |
| Bounce / recovery | High — it springs back | Low — it bags at the elbow if thin |
| Odor resistance | Excellent; wear more than once | Fine, but treat it as a sweater, not a base layer |
| Wash | Often machine-gentle; see the label | Hand wash or careful wool cycle, flat dry |
| Honest sweater price | $40–120 | $180–400 for a crew that lasts |
Pilling is a fiber-length problem
Pills form when short fibers work out of the yarn and tangle on the surface. Cheap cashmere uses short staple to hit a price. It will haze on the sides and under a bag strap in a week. Long-staple cashmere still pills a little in the first month, then settles if you shave or comb it. Merino pills at abrasion points — underarms, backpack straps — but a 17-micron jersey usually pills less than a fuzzy cashmere blend.
A sweater comb or a fabric shaver is maintenance, not a defect, the first few wears. After that, if the surface is still coming apart, the yarn was short. Read how to stop clothes pilling before you throw the thing out. And moths eat both fibers because both are keratin. Cedar and hope are not a plan; see how to prevent moths if the knit is going into storage.
Warmth-to-weight: what you actually feel
Cashmere wins on warmth per gram. A thin two-ply cashmere crew can replace a bulky merino in a dry cold office. Merino wins the moment you move, pack, or sweat: it wicks, it does not sag as fast, and it can sit against skin as a base layer. A 150–200 g/m² merino tee under a shirt is a travel trick cashmere cannot copy, because cashmere next to a sweaty back felts and smells like a wet animal faster.
For rain and wet cold, neither fiber is a shell. Wool stays warm when damp; it does not stay dry. Wear the knit under a coat. A cashmere hoodie in a drizzle is a $300 sponge.
Forty-dollar merino versus two-hundred-dollar cashmere — when cashmere is worth it
The $40 merino crew (Uniqlo, similar) is the correct default: navy, charcoal, maybe camel. Wear it, wash it on a wool cycle or by hand, repeat. Washing merino is not mysterious, and the fiber is what you want under backpacks and on planes. Step up to $80–120 merino (John Smedley-type gauge, Icebreaker midlayers) if you want a finer knit that still behaves.
Cashmere is worth $180–300 when the color is in your rotation — navy, charcoal, cream — and you will put it on 40 times a winter over a shirt, not as a base layer. It is not worth $80 in a pastel you will wear to two dinners, and it is not worth $600 for a logo if the stitch is the same two-ply you can get unsigned. One navy cashmere crew, stored clean and dry, is a wardrobe. Five discounted cashmere blends are a pilling drawer.
Questions, answered
- Is cashmere always softer than merino?
- Good cashmere is. Short-staple cashmere can feel soft on day one and itchy once the pills start. A 17-micron merino jersey is plenty soft for next-to-skin wear, which most cashmere is not built for.
- Can I machine-wash cashmere?
- Some modern cashmere is labelled for a wool cycle, cold, in a bag, then flat dry. If the label says hand wash, believe it. Heat and a dryer will felt it. Merino is the more washable of the two.
- Why is some cashmere $70 and some $400?
- Staple length, ply, gauge, and mill. The $70 piece is usually short fiber, maybe blended, knitted to a price. The $400 piece should be longer staple, denser, and recover its shape. If a $70 crew is 100% cashmere and you like the color, treat it as seasonal, not heirloom.
