Merino wool in focus: advantages and disadvantages for outdoor enthusiasts

Merino wool is among the most versatile materials for outdoor use. It regulates body temperature, naturally resists odours and feels more comfortable against the skin than many synthetic fibres. Yet this natural material also has its weaknesses. We look at who merino is the right choice for, and where alternatives perform better.

Merino wool is more than just a trend. It stands out for a range of properties that make it indispensable for outdoor enthusiasts. One of its most notable benefits is its excellent thermoregulation. The fine fibres of merino wool can trap a large amount of air, creating an insulating layer. This means it keeps you comfortably warm in winter while also having a cooling effect when temperatures rise. This ability to regulate temperature is especially valuable in changeable weather or during intense activity, as it helps keep the body at its optimal operating temperature. Another advantage is its moisture management. Merino fibres can absorb up to 35% of their own weight in moisture without feeling wet. This moisture is then slowly transported outwards, helping to keep the skin dry and prevent chilling, an important factor in avoiding colds. The wool's breathability also helps to prevent unpleasant heat build-up. Statistics show that fine 16.5-micron merino wool is among the softest varieties and can reach weights of up to 1,000 g/m² in high-quality blankets, underlining its insulating properties.

After an intense tour, synthetic clothing can quickly start to smell unpleasant. This is where merino wool shows another of its strengths: it is naturally odour-resistant and antibacterial. The surface of merino fibres is complex, making it more difficult for the bacteria responsible for unpleasant odours to attach and multiply. This means you can wear merino clothing for several days without it starting to smell, ideal for multi-day trekking tours or travelling light. This property also makes it interesting for allergy sufferers, as it reduces mite reproduction. Alongside its functionality, merino wool also impresses with its wearing comfort. Unlike conventional wool, merino wool does not itch. Its fibres are so fine and soft, often under 19 microns, that they feel gentle against the skin. This makes it the perfect choice for underwear and baselayers worn directly next to the body. The wool's elasticity and shape retention also ensure that clothing keeps its fit after frequent wear and washing rather than stretching out. Many manufacturers, including Engel and Woolville, emphasise the 'highest quality' of the temperature-regulating and odour-resistant properties of their merino products.

Despite its many advantages, merino wool also has several aspects to consider before buying. One of the most obvious drawbacks is its higher price compared with synthetic alternatives. The complex sourcing and processing of its fine fibres, as well as the high animal welfare standards now met by many manufacturers, are reflected in the price. For many people, however, the investment is worthwhile because of its durability and performance. Another consideration is the care it requires. Merino wool is more sensitive than synthetic fibres. It reacts sensitively to high temperatures, strong friction and certain detergents. Incorrect care can cause shrinkage, felting or fibre damage. Even though modern merino products are often machine washable, they still require more attention when caring for them. A knitting expert from JoelJoel, for example, warns that knitting too tightly or using needles that are too small can make merino wool feel 'like a board' and cause it to lose its fluffiness. This demonstrates how important correct handling is for preserving the material's softness and quality.

Merino wool is hard-wearing, but it is not indestructible. Compared with robust synthetic fibres, it is less resistant to abrasion and wear. Pilling or thin areas can develop more quickly, especially in high-stress zones such as under backpack straps or in the underarms. To counter this drawback, many manufacturers use material blends. Adding synthetic fibres such as nylon or Tencel increases durability without overly compromising merino wool's positive properties. These hybrid products combine the best of both worlds: the comfort and thermoregulation of wool with the robustness and longevity of synthetic fibres. In addition, sourcing the material can remain controversial in some circles despite high animal welfare standards such as mulesing-free production. Recycled wool is therefore becoming increasingly popular as a more sustainable alternative. Although merino wool is very skin-friendly for most people, some allergy sufferers are generally sensitive to wool and need to choose alternatives.