Sleeping Bags

Whether you're sleeping out while hiking, trekking, or camping, bivouacking or even staying in a mountain hut, your sleeping bag is the key piece of kit that will determine your comfort under the stars. Usage temperature, weight, packed size and type of fill are all important factors to consider before making your choice. Explore our range of sleeping bags for every adventure and find the perfect bag for your needs! Valandré, Deuter, Ferrino, Nemo, Millet… the top hiking sleeping bag brands are here to ensure you enjoy unforgettable nights outdoors!

How to choose the right sleeping bag

Hot days and freezing nights: temperatures can drop dramatically at altitude. To avoid being caught out by the cold on your treks, a good sleeping bag is essential. Let Snowleader guide you! The right model depends on your activity, the climate you'll face, and the space in your backpack. For more on the best models on the market, our complete guide to choosing the best sleeping bag covers everything from ultralight options to expedition-ready bags, including models designed for children.

The different types of fill

At the heart of your sleeping bag is the fill, which traps warm air around your body and determines its thermal performance. There are two main types: natural down, from goose or duck, and synthetic fill made from technical fibres. Each is suited to different uses, and your choice will depend on the climate and your budget.

Down or synthetic: which to choose?

Natural down offers the best warmth-to-weight ratio and compressibility, making it the top choice for lightweight hiking, long-distance trekking or mountaineering, where every gram counts. Its main weakness is moisture: wet down loses most of its insulating power. Brands like Rab and Mountain Equipment specialise in high-loft down bags, favoured by alpinists and expedition teams. Synthetic fill, on the other hand, retains its thermal properties even when wet, dries much faster and is more affordable, making it ideal for bivouacs in damp climates or family camping trips.

To sum up the main differences:

• Natural down: ultra-light, highly compressible, long lifespan, ideal for dry cold and demanding activities.
• Synthetic: moisture-resistant fibres, quick-drying, easy care, budget-friendly.

Temperatures and seasons: choosing the right gear

If you're heading out on a multi-day hike with nights in a tent or under the stars, a good night's sleep is essential. Bring a sleeping bag with a comfort temperature rating suited to the conditions, always allowing a few extra degrees for safety. Your hiking sleeping bag should provide enough insulation and thermal protection to keep your body temperature regulated throughout the night. To help you choose the right hiking sleeping bag for the season, we specify for each model the comfort and extreme temperatures at which it can be used.

Sleeping bags for extreme cold

Winter expeditions, mountaineering or bivouacs above 3,000 metres: these conditions call for a bag designed to withstand the harshest nights, the extreme cold sleeping bag. These models typically have comfort temperatures between -10°C and -30°C, high-loft down (over 700 cuin), a close-fitting mummy shape and a thermal collar at the shoulders to boost insulation and prevent heat loss. Pro tip: always trust the comfort temperature rather than the extreme temperature given by manufacturers. The former means a restful night's sleep, the latter is just a survival limit where you'll be shivering and unable to sleep.

Bag shape: mummy, sarcophagus or rectangular?

After a long day of trekking, who doesn't dream of maximum comfort? But there's still a night outdoors ahead! Sleeping under the stars after a long trek and getting a good night's sleep are not mutually exclusive. The top brands have designed trekking sleeping bags with outstanding comfort-to-weight ratios! With comfort temperatures, optimal loft and optimised shapes, you'll feel like you're sleeping on a cloud with these high-quality technical bags! The shape of the bag is crucial for both thermal efficiency and packability, and each shape suits a specific use:

• Mummy bag: tapered, body-hugging shape with integrated hood. The warmest and lightest, ideal for mountaineering and high mountains.
• Sarcophagus bag: slightly wider than the mummy, offering more freedom of movement while maintaining excellent insulation.
• Rectangular bag: spacious and very comfortable, perfect for camping or hut nights in mild weather, but bulkier and heavier.

Beyond shape, design details make all the difference. A two-way zip lets you ventilate your feet on warmer nights, while a full-length draft tube and adjustable collar at the neck help prevent heat loss. For lightweight hiking, aim for a total weight under 1 kg and a packed size that fits easily in your backpack. In the ultralight category, Sea To Summit is a benchmark, with high-loft down bags designed to disappear into the bottom of your pack.

Essential accessories for your sleeping bag

No matter how good your sleeping bag is, it only performs at its best with the right accessories. The sleeping mat is top of the list: without it, cold from the ground will cancel out much of your bag's insulation, no matter how good it is. Choose a self-inflating or inflatable model with an R-value (thermal insulation rating) suited to your season: 3 minimum for three-season use, 4 or more when temperatures drop below zero. Thermarest is a reliable choice, with models whose R-value is clearly stated and consistent over time. Add an inflatable pillow and a compression sack for a compact and truly comfortable bivouac set.

Sleeping bag liners as an extra

Some "4-season" models offer different levels of thermal protection by removing or adding sections of the sleeping bag. For milder nights or hut stays, a simple sleeping bag liner can do the job. It can also be used inside a hiking down bag to boost thermal performance, and silk or cotton construction maximises comfort and hygiene. Cotton is especially pleasant in summer for its softness and breathability, while silk liners are unbeatable for weight and packability for gram-conscious trekkers. For bivouacs without a tent or in damp conditions, bivy bags are a real plus: this water-repellent cover protects your bag from dew, light rain and wind, while adding a few precious degrees of warmth.

Care and storage of your sleeping bag

With proper care, a quality sleeping bag will last over ten years without losing performance. On the other hand, a down bag stored compressed for months or washed carelessly will quickly lose loft and insulation. A few simple rules will help preserve its potential season after season, whether it's natural down or synthetic fibre.

Tips to extend its lifespan

• Storage: never leave your bag compressed between trips. Store it unrolled or in a large cotton mesh bag so the fill keeps its loft.
• Washing: hand wash or use a large washing machine with a special down or technical fabric detergent. Avoid fabric softener, which clogs fibres and reduces loft.
• Drying: tumble dry on low with two or three tennis balls to fluff up the down and restore volume.
• In the field: always air your bag each morning before packing it away, and use a sleeping bag liner to limit direct contact between sweat and the inner lining.

For more tips, check out our blog for sleeping bag care advice and take a look at our sleeping bag care products.

FAQ: your sleeping bag questions answered

How do you choose a sleeping bag by weight and volume?

It all depends on your activity and available space. For lightweight hiking or long-distance trekking, aim for a bag under 1 kg with a packed volume around 5 litres, which usually means high-loft down fill. For camping or car bivouacs, weight is less important and you can opt for a larger, cosier and often more affordable model. Always compare weight and volume in relation to the comfort temperature rating, rather than in absolute terms.

How to combine sleeping bag and sleeping mat?

The mat is an integral part of your sleep system: without it, even the best down bag won't protect you from ground cold. Choose the R-value according to your season: 1 to 2 for summer nights, 3 for three-season use, 4 or more for winter bivouacs or above 2,500 metres. For the coldest nights, layering a foam mat with a self-inflating one lets you combine R-values and gain several degrees of warmth without adding much weight.

What comfort temperature should you choose for the season?

Manufacturers usually give three values according to the European EN 13537 standard, now replaced by ISO 23537: comfort temperature (for a restful night for a standard sleeper), limit temperature (below which sleep becomes difficult) and extreme temperature (a survival threshold, never use this as a buying guide). For three-season use in mid-mountain or lowland, a comfort temperature between 0°C and +10°C covers most spring-summer-autumn bivouacs. For winter, high mountains or polar expeditions, choose models with comfort ratings between -10°C and -30°C. A simple rule: always allow a few extra degrees compared to the forecast, as cold sensitivity varies from person to person.