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A warm, adaptable sleeping bag designed for three-season use in colder conditions
Grüezi says:
From spring to autumn is the best season for trekking tours, biking, backpacking, huts and camping. 3 season sleeping bag "DownWool Subzero 2.0" is the perfect companion here.
The problem with classic down: moisture & overheating
Down is the lightest and most insulating natural material—and extremely compressible. However, traditional down has its weaknesses: it loses its insulating properties in high humidity and can lead to overheating. This poses a real risk to comfort and rest, especially when traveling in changeable climates. This is precisely where DownWool® comes in—the intelligent evolution of down. The award-winning DownWool® sleeping bags are uniquely designed and offer solutions for precisely these weaknesses.
Heat output even at high humidity
Unlike conventional down, DownWool® retains its insulating properties even in high humidity—and even increases them by up to a third. DownWool® puffs up, trapping even more warmth. Even at 90% humidity, it remains pleasantly warm—ideal for both dry and cold, wet conditions.
Effective temperature compensation – no heat build-up, no freezing
The innovative filling consists of 70% RDS-certified animal welfare down and 30% wool from the Alps – a natural combination with high-tech functionality. DownWool® actively regulates temperature, constantly returning to skin temperature. This prevents overheating and avoids overcooling. At the same time, it absorbs moisture and wicks it away. This creates a pleasantly dry sleeping environment and a significantly wider comfortable temperature range – ideal for changeable weather.
Comfortable cut – more freedom of movement, less cold
For restful sleep, the body needs freedom of movement. The ergonomic cut of DownWool® sleeping bags offers just that: space for sleeping positions such as side sleeping or turning, even in a mummy position. The slightly more generous fit prevents cold spots because the filling is not compressed – for consistently pleasant warmth and maximum sleeping comfort.
Best sleep quality:
The natural climate-balancing insulation contributes to falling asleep faster, sleeping more deeply and overall longer, more restful sleep.
And best of all: light & compact.
In addition to their high functionality, DownWool® sleeping bags are amazingly light and packable – for more space in your backpack and maximum comfort on the go.
OEKO-TEX® STANDARD 100 certified:
Every part of the Grüezi bag® products has been tested for harmful substances and is therefore harmless to human health.
Our Verdict
The DownWool Subzero 2.0 uses a hybrid insulation, combining 700+ fill power duck down with wool, with around 399g of fill. Traditional down offers strong warmth and compressibility, but can struggle in damp conditions and feel overly warm at times. The addition of wool helps manage moisture more effectively, maintaining insulation in humid environments while creating a more stable temperature through the night. The comfort limit of -8°C feels a little generous, but it works well for autumn and early spring use, when paired with an appropriate mat.
The mummy cut is designed for efficiency but offers a slightly more forgiving fit than many others, allowing some movement in the bag without significantly compromising warmth. This balance helps maintain thermal performance while improving comfort over longer nights. A two-way J-zip provides good control over ventilation, helping regulate temperature as conditions change.
Weight and pack size sit slightly above comparable down-only bags, reflecting the added focus on moisture management and comfort. Build quality is solid, with durable fabrics and a well-considered feature set, including a pillow compartment, a 3D thermal collar, and practical storage options.
- Reviewed by Ultralight Outdoor Gear
Features
- Pillow compartment: If you put a fleece jacket, for example, into the pillow compartment, the sleeping bag has a non-slip pillow.
- Adjustable hood with Face Baffle: The thermal bulge adapts perfectly to the shape of your head. When it's cold, only a small hole remains open, reducing heat loss from the face.
- 3D thermal collar closes automatically in the zipper area, so that no cold bridge is created in the zipper area.
- Drawstring pocket: To ensure that the drawstring on the warm collar does not get in the way, it is safely stored in a simple drawstring pocket.
- Inside & outside pocket for valuables and things you prefer to keep close to you.
- Two-way zipper: Can be operated from both ends and inside/outside.
- Auto-Lock prevents accidental opening.
- Black zipper: Cooler look and better camouflage in the dark.
- Underlined Zipper cover prevents cold bridges so that heat cannot escape.
- Zipper with anti-snag zipper and lined robust webbing: This makes it even easier to operate the zipper without pinching the outer fabric.
- Foot ventilation system: The innovative zipper design allows your feet to rest comfortably on top of the sleeping bag and excess heat to escape.
- Pre-shaped foot box: When lying down there is enough space in the sleeping bag to point your toes.
- Feater loops: A warming hip bag with heating element (Feater - The Feet Heater) can be installed additionally.
- Chamber construction: H-chambers, V-shaped (on the top), pre-shaped foot area with several chambers
- Delivery: Sleeping bag, compression pack, storage bag.
Specifications
Temperature Rating
Temperature range according to EN 23537-1
- Comfort: -2°C (28°F)
- Comfort Limit: -8°C (18°F)
- Extreme: -26°C (-15°F)
Regular Specs
- Weight: 946g (excludes storage bags)
- Size: Mummy sleeping bag measuring 200 x 77 x 50 cm (Suitable for a body height of up to 178 cm in terms of weight. However, those who prefer more comfort can choose the larger size from a body height of 170 cm.)
- Filling weight: 399g
- Packed size: 18 x 31 cm, compressed 18 x 20 cm
- Pack volume: 8 l, compressed 5 l
- Colour: Autumn Blue or Black Edition
Long Specs
- Weight: 1104g (excludes storage bags)
- Size: Mummy sleeping bag measuring 215 x 80 x 50 cm (suitable for a body height of up to 188 cm in terms of weight. However, those who prefer more comfort can choose the larger size from a body height of 180 cm.)
- Filling weight: 513g
- Packed size: 20 x 32 cm, compressed 20 x 23 cm
- Pack volume: 10 l, compressed 7 l
- Colour: Pine Green or Black Edition
Material & Construction
- Outer and inner fabric: Material: Uncoated, ultra-light, durable, wind-resistant and recycled 20 denier 380T nylon – comfortable against the skin.
- If required, priming or impregnation.: Permanently water-repellent, silicone-free and based on bio-based raw materials (BeSoDRY by CHT) for optimal weather protection and maximum environmental compatibility.
- Colors: Sustainable BEMACID dyes (C2C by CHT), biologically safe, Cradle to Cradle® and bluesign® certified.
- Filling: 399 g DownWool® made from 70% high-quality duck down (90/10 with fluffiness 700+ cuin) and 30% mechanically finished wool
- Material labeling: Shell 100% polyamide, filling 70% down/30% wool - contains non-textile parts of animal origin.
Help & advice:
- How to Wash and Care for Your Down Jacket and Sleeping Bag
- The Ultimate Guide to Lightweight Sleeping Bags
- Time-Saver Guide to Choosing a Sleeping Bag
- Our Gruezi Sleeping Bag Range Explained
- About Gruezi Bag and DownWool® Sleeping Bags
- Gruezi Bag Downwool 2.0 Sleeping Bags
- The EN13537 Standard
- All About Down
