You are about to choose a sweater and you see four names: mohair, alpaca, cashmere, merino. Each sounds noble, each costs a pretty penny, and most product descriptions say more or less the same thing: "soft, warm, luxurious." That doesn't help much, because these fibers differ from one another more than such descriptions suggest. One warms best against the skin, another only as an outer layer. One pills quickly, another almost not at all. One drapes as lightly as a cloud, another hangs heavily.
Let me be honest: none of these fibers is the "best." Each is the best for something different. And that is exactly what this guide is about: not about which one wins, but which one wins in your specific situation.
A disclaimer that I owe you from the start, because we don't like pretending: we make our clothes from mohair, wool, and alpaca—we do not offer cashmere or merino sweaters. Nevertheless, I will describe all four fibers reliably, including those we do not sell, and I will say outright when something outside our sweater collection will be a better choice. We believe that a well-informed customer is the best customer, even if they sometimes buy elsewhere. Such is our philosophy.
Before we compare: where do the differences between fibers come from?
All four are animal, protein fibers, and therefore they have a common denominator: they warm, breathe, wick moisture, and require delicate care. But three features make them wear completely differently.
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Fiber thickness (microns). This determines softness and whether a sweater itches. Thinner fibers bend under the touch of the skin, thicker ones gently press on receptors—and you perceive this as scratching. I described this mechanism in detail in the text about whether mohair itches.
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Surface structure. Fibers are covered with microscopic scales. The more they protrude, the greater the tendency to itch and felt; the smoother they are, the more light the fiber reflects—hence the characteristic shine of some yarns.
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Internal structure and elasticity. Some fibers are more "hollow" inside and trap more air, meaning they warm better for the same weight. Others have more natural elasticity, so they hold their shape better and stretch less.
These three parameters combine into four completely different characters. Let's go through them one by one.
Mohair – the lightest warmth and characteristic haze
Where it comes from: Angora goats. The younger the animal, the thinner and more delicate the fiber—the finest yarns are designated as "kid" and "super kid."
Character: Mohair has a relatively smooth surface and reflects light strongly—hence its subtle sheen and that fluffy "haze" by which it is recognized from a distance. It is extremely light in relation to the warmth it provides: a sweater does not have to be thick to provide substantial warmth. It is also resilient and, what surprises many people, durable—as a fiber, it is stronger than sheep's wool of similar thickness.
Strengths: Best warmth-to-weight ratio, unique look (no one will mistake mohair for anything else), good durability, works great as an outer layer—it does not add volume under a coat.
Weaknesses: It naturally sheds delicate fibers, especially at the beginning of wear (this is a feature of the yarn, not a defect—it decreases over time). Quality can vary greatly: cheap mohair made of thick fiber can itch; good mohair is as soft as a cloud.
In our collection: This is our primary fiber, always combined with warm wool. You will find it in our Rose turtlenecks (also in a beige version), in the Rome round-neck sweater, in the Cosy boat-neck model, and also in cardigans: the button-up Inverno, the lightweight Amalfi, and the long Frozen.
Alpaca – the warmest and most "draping"
Where it comes from: Alpacas raised mainly in the Andes. It comes in many natural shades, from white to deep brown, so it often does not require intensive dyeing.
Character: Alpaca fiber has a structure with hollow spaces inside that trap air, which is why it warms exceptionally well, often better than wool of the same weight. It also has a smoother surface and contains no lanolin, which is why it is often chosen by people who find classic wool rough. It is less elastic than wool, so alpaca knitwear drapes beautifully—it has a characteristic, slightly heavy, fluid drape.
Strengths: The warmest of the four at comparable weight, soft, beautiful natural fabric drape, less prone to pilling than cashmere.
Weaknesses: The same low elasticity that gives a nice drape makes alpaca stretch more easily—that is why it must be folded, never hung. For some people, it can be simply too warm to wear in heated interiors.
In our collection: We combine alpaca with wool. You will find it in the Amber cardigan without closure and the Como sweater with a back tie—both show off this characteristic, softly draping knit pattern well.
Cashmere – the softest, most expensive, and most demanding
Where it comes from: The undercoat of cashmere goats—the finest layer of fleece that protects them from the cold. Very little raw material is obtained from one animal per year, and that is where the price comes from.
Character: This is the thinnest of the discussed fibers and therefore the softest to the touch—cashmere is the fiber about which people say "I don't feel it at all." It is light and very warm, but delicacy has its price: thin fibers pull out of the yarn more easily.
Strengths: Unrivaled softness, elegant, smooth look without fluffiness, very good warmth at a low weight.
Weaknesses: It pills most easily of the four—even expensive cashmere requires regular removal of bobbles. It is the least mechanically resistant and the most expensive. In addition, the market is flooded with cashmere of very varying quality, and a thin, cheaply made cashmere sweater can disappoint faster than a decent mohair one.
Do we have it in our offer: No. We have consciously opted for mohair, wool, and alpaca—fibers that, according to our philosophy of clothes worn for years, provide a better durability-to-price ratio. If you are looking for absolute softness and accept more frequent maintenance and a higher cost, cashmere will be a better choice than anything in our collection—and we say this straight out.
Merino – the best layer against the skin
Where it comes from: Merino sheep, raised in Australia and New Zealand, among other places. It is wool, but much thinner than classic sheep's wool.
Character: Merino is the most practical of the four. The thin fiber means that good-quality merino usually does not itch even in direct contact with the skin. Wool manages moisture perfectly—it wicks it away from the body and does not pick up odors for a long time, which is why merino is the favorite fiber for base layers and travel clothing. It also has the most natural elasticity, so it holds its shape well.
Strengths: Excellent as a layer against the skin, most odor-resistant, good elasticity and shape retention, relatively the easiest to care for (some merino yarns allow machine washing—always check the tag).
Weaknesses: The least visually striking—merino looks "ordinary," without shine and without a fluffy haze. At the same weight, it usually warms less than alpaca. And honestly: lower-quality wool, thicker than true merino, can itch—the name "wool" on the tag does not guarantee merino.
In our collection: We don't carry sweaters described as merino, but we do have wool models—like Bear with loose sleeves or River with puffed sleeves. If you are looking for a classic merino base layer to wear directly on the skin, this is a category where we are not the right address.
Quick comparison – four fibers in a nutshell
The list is simplified, because in every category the quality of a specific yarn can change the result. Treat it as a map, not an oracle.
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Warmest at the same weight: Alpaca, followed closely by mohair.
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Lightest warmth (best warmth-to-grammage ratio): Mohair.
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Softest to the touch: Cashmere, then good-quality merino.
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Best against the skin (base layer): Merino—definitely.
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Most resistant to pilling: Mohair and alpaca; least—cashmere.
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Best shape retention: Merino; easiest to stretch—alpaca.
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Most visually striking: Mohair (shine and haze); most subdued—merino.
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Most expensive: Cashmere; most accessible—wool and blends.
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Easiest to care for: Merino; others require hand washing and flat drying.
Which fiber for what – a situation guide
Here begins the most practical part, because in reality you don't choose the "best fiber," but a fiber for a specific role in an outfit. Here is how I break it down.
Layer directly against the skin – merino
A thin blouse or turtleneck worn with nothing underneath? Merino wins hands down: it doesn't itch, wicks moisture, and doesn't pick up odors during all-day wear. It is a fiber created for this role.
Outer layer under a coat – mohair
Here, in turn, mohair has no equal because it gives the most warmth with the least volume—it doesn't push out coat sleeves and doesn't make you look massive. Plus, its haze looks beautiful where the sweater is visible: at the neck, the décolletage, the wrists. If you wear it over a smooth underlayer—for example, a fitted ribbed dress—the issue of potential itching disappears entirely. I wrote a separate text about this combination: how to combine ribbing with mohair.
The warmest sweater for frost – alpaca
When warmth is the priority—a long walk, a frosty day, a cold house—alpaca gives the most. Its heavy, draping pattern also makes alpaca sweaters look soft and calm, without the "puffy" effect.
Elegant, smooth sweater under a blazer – cashmere or merino
If you want a layer that is invisible and smooth—no fluffiness, no shine—choose cashmere (if your budget allows) or merino. Mohair in this role will be too noticeable; its character is precisely that it is meant to be seen.
Evening and "going out" sweater – mohair
The opposite situation: when the sweater is to be the star of the outfit, mohair wins because it is the only one of the four with a visual special effect. A luminous haze in a deep color looks evening-ready without a single sequin.
Travel sweater – merino or mohair
Merino if you plan to wear it for many days without washing (odor resistance). Mohair if weight and volume in your suitcase matter—it takes up little space and provides a lot of warmth. Leave the alpaca at home: it is the heaviest and is the least forgiving of being crushed.
First good sweater if you are buying one – a blend
And the advice I give most often: if you are to buy one good sweater for years, consider a well-composed blend instead of a pure fiber. Mohair with wool combines light warmth and the haze of mohair with the stability and elasticity of wool; alpaca with wool—the warmth of alpaca with better shape retention. That is exactly why our sweaters are blends: they provide the character of a noble fiber and practicality in everyday wear. We write more about how we select yarns on our Our fabrics page.
The fiber is only half the truth – what comparisons don't tell you
And now the thing you won't read in most comparisons, and which in practice can be more important than the name on the tag: two sweaters from the same fiber can be of completely different quality. Three things beyond the raw material itself decide this.
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Thickness and quality of the specific yarn. "Mohair" can mean a delicate fiber from a young goat or a thick, rough one from an adult. "Cashmere"—long, durable fibers or short scraps that will pill after three wears. The fiber name is a category, not a guarantee.
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Proportions in the blend. A sweater with 5% mohair and 95% acrylic can still be called "with a mohair blend," and it wears completely differently than one where mohair makes up a significant part of the composition. Always read the proportions, not just the list of fibers.
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Grammage and weave density. The same fiber in a sparse, thin knit will give a sweater through which the wind blows; in a dense one—a warm and durable one. Grammage is sometimes more important than the raw material name—exactly the same as with cotton, where a dense ribbing warms and a thin one does not.
Practical conclusion: compare specific sweaters, not fiber names. A good sweater from a mohair and wool blend will be a better purchase than weak cashmere—and vice versa. The name on the tag tells you what to expect; the quality is decided by the workmanship.
Care: what they have in common and what sets them apart
All four are protein fibers, so they share one thing in common: they cannot stand heat, vigorous friction, or a tumble dryer. Each of them should be dried flat and stored folded, not on a hanger. I have described the full instructions—step-by-step washing, removing pilling, seasonal storage, and rescuing a shrunken sweater—in a separate mohair care guide, and these rules largely apply to the other fibers as well.
The differences lie in the nuances: merino is the most forgiving (some yarns allow for machine washing on a wool cycle, check the label). Cashmere requires the most frequent de-pilling, as it pills the fastest. Be especially careful when storing alpaca—as it is the least resilient, it stretches out the most easily, so never hang it on a hanger. Mohair will shed individual fibers, especially at first; a lint roller solves this in a few seconds.
Why we chose mohair, wool, and alpaca
Finally, an answer to a question that probably came to mind on its own: if cashmere is the softest, why don't we have it? Because we are building a brand around clothes meant to last for years—and with our philosophy of "less, but better," what counts isn't just the first impression to the touch, but also how the sweater looks after the third season. In this calculation, mohair-wool and alpaca-wool blends offer a better ratio of durability, warmth, and character to price. It is a conscious choice, not a cost-cutting measure. If you are looking for soft, light warmth and that recognizable halo, take a look at our collection of sweaters and cardigans or our cardigans and vests. And if after reading this you conclude that your fabric is cashmere or merino, that’s fine too. The best sweater is the one you actually wear.
Sandra Do Manh, founder of Nudyess
Frequently asked questions about choosing fibers
Which is warmer: mohair or alpaca?
At comparable weights, alpaca is usually warmer—its fiber has hollow spaces that trap air. However, mohair wins in the warmth-to-bulk ratio: it provides a lot of warmth with little thickness, which is why it works better as a layer under a coat, where you don’t want to add bulk.
Which is better: cashmere or mohair?
It depends on what you are looking for. Cashmere is softer and smoother, but more expensive and most prone to pilling. Mohair is lighter in relation to its warmth, more durable, and has a characteristic sheen and fluffy halo. Choose cashmere for maximum softness and a smooth, understated look; choose mohair for the visual effect, lightness, and greater durability.
Which sweater isn't itchy?
Merino and cashmere are the safest for direct skin contact because they have the finest fibers. Good quality mohair and alpaca also usually do not scratch, and for sensitive skin, it is enough to wear them over a thin, smooth base layer. The thickness of the specific fiber is what determines this, not the raw material name alone.
Which sweater pills the least?
Mohair and alpaca pill the least, especially in blends with wool and a small addition of strengthening fiber. Cashmere is the most prone, due to its very thin and short fibers. No natural fiber is completely resistant to pilling—it is a matter of scale, not a binary.
Is a blend worse than a pure fiber?
No, a well-composed blend can be a better choice than a pure fiber. Wool adds resilience and stabilizes the shape, a small addition of strengthening fiber increases durability, and a noble fiber (mohair, alpaca) adds character. Proportions are important: a sweater with a token amount of a noble fiber is something different from a thoughtful blend.
Which fiber to choose as a base layer under other clothes?
Merino—it is the thinnest of the wools, wicks moisture away from the body effectively, and doesn't hold odors for a long time, so it works great when worn directly against the skin for many hours. Mohair and alpaca perform better as a visible layer: a sweater or cardigan on top.
Can alpaca be hung on a hanger?
Better not. Alpaca has the least natural elasticity of the fibers discussed, so it stretches out most easily under its own weight, especially in the shoulders. Store alpaca sweaters (and basically all sweaters made of animal fibers) folded on a shelf.
