Nordisk sleeping bags 2026: down or synthetic?

Nordisk is no newcomer to the outdoor market. Founded in Copenhagen in 1901 as Northern Feather, the company started out processing feathers and down for bedding. The first sleeping bag followed in 1941, and the story has been running ever since.

The company has traded as Nordisk since 1991 and ranks among Europe's leading sleeping bag manufacturers. One detail stands out: every down model in the collection is still made in Germany, which speaks for European quality standards and short supply chains.

Down or synthetic. The question comes up with every sleeping bag purchase, and both fills have genuine strengths and real weaknesses. What tips the balance is where and how you sleep.

Down owes its outstanding warmth to its structure: the three-dimensional clusters trap air and form a natural insulating cushion. Fill power is what counts, measured in cuin (cubic inches per ounce). The higher the figure, the more air the same amount of down traps, and the warmer and lighter the bag. Nordisk's CRYSTAL DOWN® sits firmly in premium territory at 750 cuin in the Nansen and 800 cuin in the Walloe.

Synthetic copies the principle of down using reconstructed polyester fibres. The decisive advantage: synthetic keeps insulating when it gets damp or soaked, whereas down clumps together and loses much of its loft the moment it gets wet. For rainy coastal regions, humid woodland or trips with frequent bivvies under open sky, synthetic is the safer bet.

Care is simpler too. Synthetic bags go straight into the washing machine, while down models need specialist treatment. That effort pays off, because good down lasts considerably longer when it is looked after properly.

After the fill, the shape of the bag is the factor people underestimate most. Nordisk offers three cuts, aimed at different sleeping types and conditions.

Mummy: the mummy bag hugs the body closely, tapering deliberately from shoulder to feet. That cuts the air space your body has to heat to a minimum, which delivers maximum warmth at the lowest weight and the smallest packed size. It is the pick for anyone counting grams, sleeping in the cold or covering long backpacking days. The downside: restless sleepers and anyone who wants room can find it confining.

Wide: the wide cut keeps the mummy's benefits, the tapered shape and the good thermal seal, but frees up space across the shoulders and chest. Good for broader shoulders, side sleepers, and anyone who feels boxed in by a mummy. It weighs a little more; the comfort gain is considerable.

Blanket: a blanket bag unzips completely and lays out flat, working as a blanket, a quilt or, zipped to a second bag, a double. That makes it the most versatile format, with a thermal price: the body is less enclosed and more warmth escapes. On mild summer nights, or as a hut blanket, it is often the most comfortable option.

The current collection covers three shapes (mummy, wide, blanket) across a range of temperature ratings. For most trips in Europe and the Alps, four models stand out: Ides and Iver carry the down line, Knuth and Bjarni the synthetic side.

The Ides is Nordisk's most versatile down model and a natural fit for three-season use. With 600+ cuin fill power and 90/10 European duck down, it strikes an excellent balance of warmth, weight and packed size.

It comes in mummy and wide versions, which matters if you need room to move in your sleep. The Ides ±0° mummy is rated comfort 4°C, limit -1°C and extreme -17°C, covering spring and autumn trips as well as summer tours in the Alps up to mid altitudes. The down is certified CRYSTAL DOWN®: RDS-audited, treated PFC-free, sourced from European farms.

Anyone out in deep winter, or planning expeditions above 3,000 metres, needs more than a standard sleeping bag. The Iver was built for exactly that: 700+ cuin fill power, a comfort rating of -4°C and a limit of -10°C put it in serious winter territory. Those figures apply to the Iver -10, the coldest of the three versions. For less extreme plans, the Iver 0 (limit 0°C) and the Iver +5 (limit +5°C) cover spring, autumn and summer.

What unites all three: the inner comfort stays identical across the range, because the insulation only builds outwards. Freedom of movement and lying comfort do not change with the warmth rating.

Construction-wise, the Iver gets an extra-wide thorax, which leaves room to move even over a thick base layer, and a 3D hood that wraps closely around the head and limits heat loss where it hurts most. Like every Nordisk down model, the Iver is made in Germany with CRYSTAL DOWN® and a PFC-free water-repellent finish.

The Knuth is Nordisk's synthetic answer for anyone who avoids down, travels regularly in damp climates or simply wants a bag that is easier to look after. Four temperature versions are available: +10°C, ±0°C, -10°C and -20°C, spanning everything from summer camping to a serious winter trip.

One thing sets it apart. The Knuth is the only model in the collection that also comes in size S, which matters for smaller adults and for teenagers still growing into a full-size bag. The fill is Norguard S-PO 85, a high-grade recycled polyester fibre that insulates well and dries fast.

Like every Nordisk bag, the Bjarni speaks to outdoor people who put sustainability first, and then it goes a step further: 100% recycled outer and lining fabrics, 100% recycled fill, completely PFAS-free.

The three versions (+10°C, ±0°C, -10°C) cover the usual three-season range. For spring and summer trips in the Alps, lakeside camping or hut tours outside winter conditions, the Bjarni is a sustainable option that asks for no comfort trade-off.

Nordisk backs its sustainability claims with standards you can check:

Down models (Ides, Iver):

• CRYSTAL DOWN® — proprietary standard, RDS-certified (Responsible Down Standard)
• European duck down from controlled farming
• PFC-free water-repellent finish on all outer fabrics
• Made in Germany

Synthetic models (Knuth, Bjarni):

• 100% recycled fill (Norguard S-PO 85 / proprietary recycled fibre)
• 100% recycled outer and lining fabrics on the Bjarni
• Completely PFAS-free, no fluorochemicals