DownWool® insulation filling

DownWool® – the superior down. A perfect symbiosis of down and wool.

DownWool 2.0 is the best natural insulation currently available in the outdoor industry. 

DownWool® is an innovative insulation made from a material blend of 70% down and 30% wool. The result: pleasant warmth, low weight and high wearing comfort – even in difficult weather conditions.

The advantages of DownWool® at a glance

  • Provides reliable heat
  • It also works in wet conditions.
  • Breathable & temperature regulating
  • Natural & sustainable
  • Easy to care for & durable

DownWool® is perfect for anyone who appreciates reliable warmth, high comfort and sustainability – whether hiking, skiing, traveling or in everyday life.

DownWool 2.0 from spring 2026

With DownWool 2.0, Grüezi bag offers an even more powerful, sustainable insulation solution for demanding outdoor adventures.

The improved insulation performance of DownWool 2.0 is achieved through an additional production step in which the wool acquires a finer structure and significantly more loft. This allows the wool to trap more air, thus increasing the insulation performance while maintaining the same fill weight. DownWool 2.0 now achieves the warmth-to-weight ratio of pure down. 

The 3-season Subzero sleeping bag features DownWool 2.0, which improves the EN comfort temperature by an impressive 4°C, while maintaining the same weight and dimensions.

 

DownWool® and down in comparison

  DownWool® DownWool 2.0 Daune
Heat-to-weight ratio Very good - similar to down Excellent – ​​unbeatably light & warm Excellent – ​​unbeatably light & warm
Moisture behavior Significantly better than down - wool actively regulates moisture. Significantly better than down - wool actively regulates moisture. Bad – clumps when wet, loses insulation
Temperature regulation Excellent - compensates well for temperature fluctuations Excellent - compensates well for temperature fluctuations Good, but rather “tight”, tends to overheat
Odor resistance Better - wool has antibacterial properties Better - wool has antibacterial properties Worse – can absorb odors

 

DownWool® under the microscope: This section shows a 0,005 mm section. You can clearly see how the wool (brown fibers) is embedded in the down (white fibers).

How does DownWool® work?

The DownWool® combination is patent pending and offers significant advantages over pure down or wool products: Temperature and humidity regulation No chemicals! 

  • Daune It is lightweight and packs down small, much lighter than wool, and provides excellent warmth. However, down only insulates as long as it is dry and fluffy. Humidity (Due to condensation, perspiration, or humid air), the fine branching of the down collapses, the down clumps together, and the Insulation capacity decreases significantly..
  • DownWool® - the better down: To eliminate the moisture problem, Grüezi bag® has naturally enhanced its functionality by combining it with wool. The combination is perfect: the 30% wool content absorbs moisture from the air and perspiration, keeping the down dry and preserving its insulating properties. Even in high humidity conditions of up to 90%, DownWool® offers superior warmth.
  • Chemicals are often used in outdoor products to make down water-repellent. With DownWool®, this treatment is unnecessary thanks to the addition of wool. Wool can absorb up to 30% of its own weight in moisture. This naturally keeps the down drier and fluffier, thus preserving its insulating properties.
  • The wool fiber It consists of many small tunnels with capillary action. This allows it to absorb and release more than 30% of its own weight in moisture. It thus ensures effective hydration. Regulation of moisture and body temperature.
    • Wool absorbs moisture and releases it gradually to the outside. This regulation allows for a warming or cooling effect and creates a dry, pleasant body climate. 
    • Even when wet, it retains its warming properties, something no other material can do.
  • Wool is antibacterial and odor-neutralizing.
  • Larger temperature range: DownWool® products have a wider temperature range where you feel comfortable. Wool balances out temperature fluctuations.
  • Best sleep quality: Longer sleep, faster falling asleep and better sleep through the night are possible thanks to the wool content in the DownWool® insulation filling.

What is DownWool®?

The insulation “DownWool®” consists of 30% mulesing-free wool from the Alpine region and 70% RDS-certified down.

In DownWool® the Both materials mixed in a perfect ratioThrough a technically sophisticated, mechanical process without added chemicals, down and wool are permanently bonded, making them washable. You can sometimes feel irregularly shaped bonds between the wool and down with your fingers, which shows that DownWool® is not a fleece.

DownWool® is made in Germany and machine washable at 30°C. So you can rely on a durable and uncomplicated product looking forward.

DownWool® tested by Hohenstein Laboratories

We had our Grüezi bag® DownWool® filling tested to determine how its volume behaves at different levels of humidity. The renowned testing institute "Hohenstein Laboratories GmbH & Co. KG" exposed DownWool® to a relative humidity of 50% to 90% at 23°C and measured the volume change.

The testing process

To determine the volume, the filling material was filled into a cylinder (39 cm diameter) and the height was measured at three different locations. The measurements were taken after 24 hours of conditioning at different humidities.

The first measurement was carried out in the specific standard climate (23 °C and 50 % relative humidity) and increased to 90 % humidity.

Download test report from the Hohenstein Institute (PDF)

The result is sensational:

While down loses volume as humidity increases and therefore no longer provides warmth, The volume of the DownWool® filling material increases as the humidity increases and DownWool® insulates even better!

Specifically: DownWool® increases its loft by up to 28,9% at humidity levels of up to 90%. And more loft means better insulation, even in high humidity. The reason lies in the properties of the wool fiber: Wool swells when it absorbs water, increasing its volume by up to 30%.

Filling volume DownWool®: Test result report no. 24.1121291, 16.07.2024, conducted by Hohenstein Laboratories GmbH & Co. KG

 

DownWool® is available in the following Grüezi bag® products:

DownWool® jackets and vests

The Jackets with DownWool® insulation They create a warm, dry, and comfortably pleasant body climate completely without chemicals. DownWool® balances temperature fluctuations that occur between periods of activity and rest, or when moving from indoors to outdoors. Furthermore, wool regulates moisture and provides warmth even when damp. These lightweight jackets also feature a sophisticated cut that guarantees freedom of movement, a small pack size, wind- and water-repellent recycled outer materials without PFC treatment, and extended sleeves and back.

DownWool® sleeping bags

DownWool® insulation has been available in sleeping bags since 2016. Depending on the temperature range, wool is combined with down as insulation ("DownWool®"), or for very cold temperatures, wool fleece is used inside a down sleeping bag ("DownWool® Hybrid").

The high-quality Grüezi bag® sleeping bags have received numerous awards for their climate and cut.

DownWool® sleeping mat

This lightweight trekking mat is suitable for year-round use, including trekking, mountaineering, travel, and camping. The insulation, consisting of foil and DownWool® fleece, achieves an R-value of 3,9.

 

DownWool® or Silkwool jackets? When do we recommend which insulation in a jacket?

If you need an insulating jacket for outdoors or on the mountain, then a Grüezi bag® jacket with DownWool® or SilkWool filling is ideal. Because the natural material insulates even in high sweating and humidity conditions and offers a excellent wearing climate in a wider temperature rangethat makes you feel comfortable. Ideal when you're on the move!

  • The "Refreshful SilkWool Jacket" is a versatile all-season jacket with light insulation (made of 50% wool and 30% silk), ideal for very active activities.
  • For colder days, the DownWool® jacket with insulation made of 70% down and 30% wool is ideal because, unlike pure down, it also insulates in high levels of sweating and humidity, and the wool content ensures a better wearing climate.
    • The "Senseful DownWool Jacket" is a warming jacket for weight fetishists while trekking, biking, hiking, taking breaks up on the mountain, or for the city.
    • The "Lightful DownWool Jacket" is a versatile insulation jacket for cool autumn and spring days.
    • The "Faithful DownWool Jacket" is a warm insulation jacket – ideal for winter sports such as skiing and winter hiking, cold days on the bike, or leisurely strolls through town.

DownWool® or Alpine wool? When do we recommend which insulation in a sleeping bag?

  • The sleeping bags with DownWool® filling offer an optimal balance of insulation and weight. The down content (90/10 duck down with 650+ fill power) cuinIt provides excellent insulation and makes the sleeping bag lightweight. Thanks to its moisture-regulating properties, the wool ensures an optimal sleeping climate.
  • Sleeping bags with AlmWolle insulation are designed for temperatures well above zero. They particularly excel in high humidity, such as near rivers, lakes, or the sea. AlmWolle can absorb a great deal of moisture without losing its insulating properties. This is why you'll always have a warm, dry sleeping bag with AlmWolle.