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Why choose a merino wool base layer?

Outdoor activities, How to choose -guides by Varuste.net, 10.2.2026

In collaboration with Devold

Merino wool has long been the trusted base layer material for hikers, outdoor enthusiasts, and active people. It is nature’s own super material, performing well both in everyday life and in demanding conditions. A merino wool base layer is often the first layer against the skin, which is why its properties are crucial for the overall functionality of your clothing system.

The best qualities of merino wool

A merino wool base layer is suitable for year-round use, as it adapts well to both warm and cold weather conditions.

Warm even when wet: Unlike many synthetic materials, merino wool insulates even when damp. This makes it especially reliable in changing and cold weather conditions.
Breathable and moisture-wicking: Merino wool efficiently wicks moisture away from the skin and helps keep you dry. It feels comfortable both during intense activity and breaks.
Naturally odor-resistant: Merino wool repels bacteria, so the garment doesn’t start to smell easily. This is a big advantage on multi-day hikes and trips when washing opportunities are limited.
Soft and pleasant against the skin: Modern merino wool does not itch. The fine fibers are suitable even for sensitive skin.
Versatile and durable choice: Merino wool base layers work in many different uses and environments. With proper use and care, they last a long time.

How to choose the right thickness for a merino wool base layer?

The thickness of merino wool is usually indicated in grams per square meter (g/m²). The right thickness depends on how and where you use the base layer.

For active movement and sunny weather, choose extra light: about 130 g/m²

Extra light merino wool is suitable for warm conditions and intense activities such as running, summer hiking, or active outdoor pursuits. It breathes efficiently and feels almost unnoticeable on.

Reliable all-round layer is light: 150–190 g/m²

Light merino wool base layers are a favorite for year-round use. They work well for everyday wear, hiking, and travel. Easy to combine with other layers.

Versatile and flexible, medium weight: 190–205 g/m²

Medium weight merino wool offers a good balance between warmth and breathability. It’s suitable for active outdoor use in cooler conditions, such as autumn hikes or winter sports with layering.

For cold and less active use, thick: 230–235 g/m²

Thick merino wool keeps you warm even in freezing temperatures. It’s a good choice for skiing, ice fishing, and other winter activities where you alternate between movement and standing still.

Extra thick for extreme cold: 235 g/m² and above

When the temperature drops well below zero, extra thick merino wool base layers provide maximum insulation. Especially suitable for arctic conditions and severe cold.

Made to last for generations

Devold is a pioneer in wool clothing, making wool garments with great passion from the very beginning. Most Devold garments are made from 100% merino wool or a combination of merino wool and other natural materials. Synthetic fibers are only used when they genuinely improve the garment’s durability or flexibility.

See all Devold products