Merino Wool – What Is It Made From and What Sets It Apart from Traditional Wool?

Merino wool is one of those materials we hear a lot about, but it is not always clear what actually makes it different from other types of wool. Where does it come from? Why is it so soft? What are its advantages and disadvantages? And is it really suitable for both a warm winter sweater and lightweight clothing for warmer days?

If you already know us a little, you know that we consider merino one of the most versatile natural fibres. We use it to make clothing and accessories. Wool clothing keeps you warm in winter, helps prevent overheating in summer and can also provide a certain level of protection against UV radiation.

Fabrics and knitwear made from merino help the body maintain a comfortable temperature. They work well in both warm and cold conditions, from mild weather to more demanding environments. Compared with other materials, merino provides excellent warmth even at a lower fabric weight.

If you are wondering what merino wool is made from, the answer is simple: it is made from the fleece of Merino sheep. These sheep live, among other places, in the mountains of New Zealand. The unique structure of their fleece is what makes merino fibres exceptionally fine, elastic and pleasant against the skin.

At KOPYTO, it is one of our favourite materials. We love it for the combination of natural origin and functionality. Merino wool is not a magical or perfect material, though. It has many advantages, but there are also a few things worth knowing before you buy it.

If you are curious about the structure of merino fibres and how the material is obtained, this article is for you. Stay with us to find out why merino is such a remarkable material, what makes it special and what its key benefits are.

What animal does merino come from?

Merino wool comes from Merino sheep. Their distinctive feature is an especially dense and fine fleece that protects them from changing weather conditions. The history of Merino sheep goes back to Spain, where the breed was developed and valued many centuries ago. Over time, Merino sheep were introduced to countries including Australia and New Zealand, which are now important centres of merino wool production.

Australia remains the world's largest producer of Merino sheep wool and supplies a significant share of the global market. Australian sheep differ slightly from those in New Zealand – their fleece, for example, tends to be somewhat coarser. However, their wool has similar key properties.

The wool grows naturally. A sheep develops a new fleece over the course of a year, which is then removed during shearing. Shearing is a standard part of sheep husbandry and is important for animal welfare. It is usually carried out once a year, generally in spring. The fleece can be obtained without harming or killing the animal.

The fleece of Merino sheep is the raw material used to produce Merino wool, which is later turned into yarn, knitwear and fabrics.

It is also worth knowing that the term “merino” does not refer to one specific fibre thickness. Depending on the breed and intended use, fibres can have different diameters. According to Woolmark, the diameter of Merino fibres typically falls below 22 microns, while the finest grades measure less than 17.5 microns. Our finest product has fibres measuring just 16 microns! Discover the Pantera here.

For comparison, the average human hair is around 50–100 microns in diameter. This gives you a good idea of just how fine merino fibres can be.

How is merino wool made?

The process naturally begins with the sheep. The fleece is sheared and then goes through several stages of preparation. Raw wool does not go straight into a sweater. First, it needs to be cleaned, sorted according to quality and then prepared for spinning.

During sorting, factors such as fibre length and fibre thickness are taken into account – more precisely, the diameter of individual fibres. This parameter has a major influence on how soft the finished material feels. The finer the wool fibres, the softer the finished material can be.

The fibres are then prepared for spinning. This produces yarn, which can be used to make either knitwear or woven fabrics. Depending on how it is processed and how thick the yarn is, Merino wool can be used for a wide range of applications.

Fine fibres can be turned into lightweight Merino wool clothing, often used for sportswear such as T-shirts or thermal base layers. Thicker yarn can be used to make sweaters, hats, scarves and other garments.

This is important because the label “100% merino” does not tell you everything about a product. Two garments made from exactly the same raw material can differ in weight, knit structure, softness and care requirements.

That is why, when buying Merino clothing, it is worth looking beyond the material name and checking the product specifications and care instructions as well, especially when it comes to everyday use.

How is Merino wool different from ordinary wool?

One important difference is fibre thickness. Merino wool is generally much finer than fibres from many other sheep breeds. This has a significant impact on comfort.

With traditional wool, thicker fibres can be more noticeable against the skin. That does not mean that all ordinary wool is scratchy or that all merino is perfectly soft. In both cases, much depends on the specific fibre quality. Traditional wool can, however, sometimes feel less comfortable against the skin.

Fibre diameter is one of the most important factors affecting how a material feels against the skin. Merino fibres are fine and bend more easily under the pressure of the skin instead of irritating it during movement. This makes them particularly suitable for clothing worn directly against the body. Fibre thickness also influences the breathability and air permeability of the material.

So, does merino wool itch? There is no single answer. Fine Merino can feel extremely comfortable against the skin. If the material is made from thicker fibres, however, the feel may be different.

The intended use also differs. Fine merino fibres make it possible to create clothing worn directly against the skin, which is why the material is so popular for thermal underwear, T-shirts and socks. Many leading outdoor brands, including Jack Wolfskin, Icebreaker, Helly Hansen, Fjallraven and Smartwool, use this material to varying degrees. Buff, Brubeck and traditional Polish brands also use merino. Icebreaker, for example, produces both sportswear and more casual clothing.

Thicker wool fibres are more commonly used where durability and resistance are the main priorities.

Merino also has typical wool properties: elasticity, the ability to absorb water vapour, temperature regulation and resistance to odours, thanks to the natural properties of wool fibres. Wool can absorb a significant amount of water vapour, helping to maintain a drier microclimate next to the skin.

This excellent moisture management is one of the reasons why Merino wool clothing performs so well during physical activity. It is therefore ideal for sportswear and many different types of exercise. We always encourage you to take our “little animals” cycling, to yoga, ski touring or on a mountain walk!

Merino wool helps maintain a comfortable body temperature and a pleasant feeling against the skin. Wool clothing can help reduce excessive sweating and the development of unpleasant odours.

Why is merino so soft?

Softness is probably the first thing we notice when we pick up a product labelled merino wool. And it is not a coincidence.

The main factor responsible for this is fibre diameter. Fine fibres are more flexible and bend more easily under pressure. They do not stick out stiffly from the surface of the material, so the skin perceives them as softer and more delicate.

Woolmark points out that Merino fibres are very fine and can be significantly thinner than human hair. Their structure makes it possible to create a material that is also comfortable to wear directly against the skin.

Softness is not the only advantage, though. Merino fibres are naturally elastic. They work a little like tiny springs: they can bend as you move and then return to their original shape. This means that Merino fabric can adapt well to the body and is less prone to creasing than some other fabrics.

This is useful for everything from sweaters to lightweight T-shirts and sportswear. Merino wool clothing can remain comfortable for many hours, even during intense activity. Just think about it: Merino sheep wear their own “wool sweaters” all year round!

That said, it is worth keeping a realistic perspective. One of the advantages of Merino wool is its softness, but not every product will feel equally delicate. The final result depends on the fibre diameter, yarn construction and the way the material is made.

And what about odours? That is another quality you can really appreciate in everyday use. Wool fibres absorb water vapour and can bind odour molecules. As a result, wool garments often stay fresh for longer than products made from some other fibres. Research cited by Woolmark has found lower odour intensity after wear for wool compared with polyester and cotton.

That is why Merino wool clothing does not need to be washed after every wear. Sometimes regular airing, preferably outdoors, is enough. This is particularly convenient when travelling, but it also helps extend the life of your clothes and reduce water and energy consumption.

Is merino a natural material?

Yes. Merino is a natural fibre of animal origin. Unlike polyester or acrylic, it is not made in a factory from petrochemical raw materials. The fleece grows on the sheep and is then harvested, cleaned and processed into yarn.

Wool is a protein fibre. Its main component is keratin – the same protein that is also found in human hair and nails.

Natural origin does not automatically mean that every Merino product is ethically made. It is worth paying attention to how the raw material is obtained and to the entire supply chain. One example of a standard that covers animal welfare, land management and supply-chain control is the Responsible Wool Standard, which KOPYTO is certified to as the first brand in Poland. RWS also includes requirements concerning the prohibition of mulesing on certified farms, among other criteria.

This is important to us, too. At KOPYTO, we believe in certification and choose only verified Merino wool with RWS certification. All of our suppliers and production facilities we work with are covered by certification. We want to have as much concrete information as possible about where our raw material comes from rather than relying solely on general claims about “ethical wool”.

We are glad that certification and animal welfare are increasingly being discussed in the so-called mainstream media. Avoiding practices such as mulesing is also becoming increasingly common as a way of improving animal welfare. Mulesing involves removing sections of skin from sheep in an effort to manage hygiene in Merino sheep.

Natural origin also has practical benefits. Merino wool is a biodegradable natural fibre and, when properly cared for, can last for many seasons. At the same time, it requires a little more attention than most synthetic materials, which could be considered one of the disadvantages of wool. Excessive heat when washing wool, vigorous rubbing or improper drying can damage the material.

This is not a huge challenge, though. To care for wool properly, you only need to follow a few simple rules. Use a gentle detergent designed for delicate fabrics and opt for hand washing where possible. Lukewarm water, around 20–30°C, is ideal. Never dry wool garments on hangers and certainly do not put them in a tumble dryer. Instead, dry them flat unless the care label specifically says otherwise.

So, does Merino have any disadvantages? Of course. The most common ones include its higher price, the delicacy of some fine knits and the need for careful, gentle care. This does not take away from its advantages. It simply means it is worth knowing what you are buying and what you can expect from the product.

And perhaps that is what makes Merino so interesting. It is not simply “soft wool”. Merino wool combines natural origin with specific functional properties: temperature regulation, elasticity, breathability, softness and effective moisture management. It also has self-cleaning properties that can help limit bacterial growth.

So if you are wondering what Merino wool actually is, the answer is more than simply “wool from a sheep”. It is a specific type of wool whose distinctive properties are mainly the result of the structure and fineness of its fibres. That is exactly why it works so well in both everyday clothing and garments designed for physical activity.

And if you want it to last, remember one thing: good fibre is only the beginning. The quality of the construction, proper care and whether you will actually wear the garment for a long time are just as important.