Choose the right sleeping bag – complete guide

Choosing the right sleeping bag is all about understanding where , when and how you’ll be using it. Location, season, pack volume, weight and temperature are all crucial factors – and affect everything from material to fit and filling. Here we go over what you need to consider when choosing a sleeping bag for your next adventure.

What should you consider before choosing a sleeping bag?

Think about how you will use the sleeping bag :

• Hiking in the mountains? → light & compressible.

• Winter trips? → warm and strong insulation.

• Abrasive surfaces, moisture or daily use? → robust and easy to maintain.

Weight and pack volume are often crucial when you're carrying everything on your back. For sledding trips, you can prioritize comfort and warmth instead.

Temperature grading – how it works

How warm a sleeping bag feels depends on the climate and how it is used: cold, damp or dry, and whether you carry everything yourself or pull it in a sled.

To make the choice easier, there is the European standard EN 13537 , which provides a common benchmark for temperature classification. Three values are used here:

Comfort

The lowest temperature at which a standardized woman (25 years old, 60 kg, 160 cm) can sleep comfortably in a relaxed position.

Limit

The lowest temperature at which a standardized man (25 years old, 70 kg, 173 cm) can sleep comfortably in a curled up position.

Extreme

Here, the sleeping bag offers some protection against the cold, but the risk of hypothermia is significant with prolonged exposure (based on a standard woman in a crouched position for up to 6 hours).

Thermal balance – what affects how warm you feel in your sleeping bag?

A sleeping bag does not create heat – it retains the heat you produce. How warm you feel in the bag therefore depends on several factors:

Physiology

• People with more fat or muscle mass retain heat longer.

• Women tend to freeze faster than men due to different fat distribution and blood circulation.

• With age, muscle mass and metabolism decrease → less heat production.

• A well-trained, rested person is more resistant to cold.

• If you have recently eaten, heat production increases.

Heat conduction

The greatest heat loss occurs downwards. Your body weight compresses the insulation beneath you and reduces its effectiveness. That's why a good sleeping pad is absolutely crucial.

Convection

The more air space in the sleeping bag, the more cold air circulates. A “just right” tight sleeping bag is always warmer than one that is too big.

The effect of the wind

Wind and airflow quickly cool the air layer around the sleeping bag. Choose a sleeping spot that is protected from the wind.

Evaporation

The body's sweat production affects how warm you feel. Breathable materials wick away moisture and retain heat.

Seasons and sleeping bag choices

Summer sleeping bag

• Too hot temperatures

• Focus on ventilation and moisture transport

• Down → light and compact

• Synthetic → better performance in moisture, but larger packing volume

3-season sleeping bag

• For spring, summer and autumn

• High thermal comfort during cool nights

• Available in both down and synthetic

• Down → lower weight

• Synthetic → better moisture resistance

Winter sleeping bag

• For sub-zero temperatures and harsher climates

• Down is most often chosen for its best warmth-to-weight ratio.

• Provides maximum warmth with minimal bulk

Tip – combine the right equipment

A sleeping bag works best as part of a complete sleeping system:

• A good sleeping pad provides more warmth than many people think.

• A down jacket or an extra layer can increase the comfort temperature

• The right tent location reduces the impact of wind and moisture

• A sleeping bag/liner can provide extra warmth or protect the sleeping bag from wear and tear.