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A lightweight, comfortable sleeping bag suited to high summer and warm-weather trips
Grüezi says:
Weighing only 450 g and with a compressed pack size of 13 x 17 cm—about the size of a hand—the "DownWool Extreme Light 2.0" sleeping bag is the ideal summer sleeping bag for trekking, biking, camping, hut stays, and the Camino de Santiago.
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 Extreme Light 2.0 uses a hybrid insulation, combining 700+ fill power duck down with wool, with around 180g of fill. Traditional down offers excellent warmth and compressibility, but can struggle in damp conditions and may 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. With a comfort limit of 8°C, it is well suited to warm summer nights, hut stays, and long-distance routes such as the Tour du Mont Blanc or Camino de Santiago.
The mummy cut is shaped for efficiency but remains slightly more relaxed than many ultralight designs, allowing for comfortable movement without losing too much heat. A two-way zip offers good ventilation control, which is particularly useful in warmer conditions where temperature regulation is key.
Weight and pack size are kept low at around 501g, making it easy to integrate into a lighter pack without compromise. Build quality is solid, with durable fabrics and a well-considered feature set, including a pillow compartment, and an adjustable hood.
- Reviewed by Ultralight Outdoor Gear
Features
- Adjustable hood: The hood adapts well to the shape of the head.
- Pillow compartment: If you put a fleece jacket, for example, into the pillow compartment, the sleeping bag has a non-slip pillow.
- Inside pocket for valuables and things you prefer to keep close to you. zipper:
- YKK two-way zipper: operable from both ends.
- Zipper with reinforced webbing underneath: This makes the zipper even easier to use without pinching the outer fabric.
- Auto-Lock prevents accidental opening.
- White zipper: easy to find in the dark.
- Underlined Zipper cover prevents cold bridges so that heat cannot escape.
- Foot ventilation system: The innovative zipper design allows the feet to be comfortably placed on top of the sleeping bag, allowing excess heat to escape.
- Pre-shaped foot box It provides space to rest your toes.
- Feater loops for attaching the additional heat inlet Feature - The Feet Heater
- Chamber construction: quilted chambers
- Machine washable: easy to clean
Specifications
Temperature Rating
Temperature range according to EN 23537-1
- Comfort: 12°C (53°F)
- Comfort Limit: 8°C (46°F)
- Extreme: -4°C (25°F)
Regular Specs
- Weight: 501g (excludes storage bags)
- Size: Mummy sleeping bag at 200 x 77 x 50 cm (suitable for body height up to 178 cm; for more comfort, those above 170 cm can choose the next size up).
- Filling weight: 180g
- Packed size: Ø 13 x 22 cm, compressed Ø 13 x 17 cm
- Pack volume: Compressed 2.5 litres
- Colour Viridian Green or Black Edition
Long Specs
- Weight: 519g (excludes storage bags)
- Size: Mummy sleeping bag with 215 x 80 x 50 cm (suitable for a body height of up to 188 cm when considering the sleeping bag's weight. However, if more comfort is preferred, the next larger version is recommended for individuals over 180 cm tall.)
- Filling weight: 195g
- Packed size: Ø 13 x 24 cm, compressed Ø 13 x 18 cm
- Pack volume: Compressed 2.5 litres
- Colour: Warm Olive 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: 195 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.
- Range: The ideal summer sleeping bag for trekking, biking, camping, in the hut, and for the Camino de Santiago.
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
