Comfort: the lowest temperature at which an average woman sleeps comfortably in a relaxed position. Plan with this figure if you sleep cold.
Limit: the lowest temperature at which an average man sleeps eight hours, curled up, without waking from the cold.
Extreme: a survival rating, the lowest temperature at which an average woman can stay in the bag for six hours. Never plan a night around it.
The figure in a bag's name is not always the comfort temperature. All three ratings are explained in our sleeping bag and mat FAQ.
Down or synthetic
Down is lighter and packs smaller for the same warmth, and fill power in cuin shows its quality: the higher the figure, the less down the bag needs. Synthetic fill copes better with damp and dries faster.
Size and mat
A bag that is too big leaves more air to warm, and one that is too small compresses the fill, so choose by your body height. Ratings are measured with the bag on an insulated mat. As a guideline, choose an R-value under 2 for summer, 2 to 3.9 for three-season use and 4 to 5.4 below freezing.
Care and add-ons
Store the bag loose in a storage bag and use the pack sack only for travel. Care & Repair in Görlitz washes, refills and repairs sleeping bags. A liner or down add-on from our sleeping bag accessories can raise the temperature inside the bag.