Since 2002, the European standard EN 13537 allows to seamlessly assess the operating temperature of a sleeping bag. It allows to compare products of different brands. However, it is not mandatory, we must pay attention to temperatures mentioned by some manufacturers, and check the reference to the standard of the sleeping bag.
-Comfort temperature: it corresponds to the minimum temperature at which the user in a “Lax” position (typically lying on his back, arms along the body) is in thermal equilibrium, without feeling the cold (this temperature is calculated for a “standard woman”). A woman dressed 60Kg of warm underwear spend a comfortable night.
-Temperature limit (or comfort limit): it corresponds to the minimum temperature at which the user, in a fetal position, will be in thermal equilibrium without feeling the cold (the temperature is calculated for a “standard man”). A man dressed 80Kg of warm clothing can sleep without feeling cold.
-Extreme temperature: the temperature limit and extreme (risk zone), the user will experience in a fetal position a strong feeling cold. In approaching the extreme temperatures, the risk of damage to health by hypothermia is real. Beyond extreme temperature, hypothermia risk of death is serious (this temperature is calculated for a “standard woman”).
-Sometimes a fourth temperature is added: the maximum temperature, which corresponds to the temperature at which the user, partially covered with the sleeping bag, can sleep without excessive sweating (this temperature is calculated for a “standard human”).
There are on the market today two main types of filling for sleeping bags: the down and synthetic fibers.
Feathers component a sleeping bag down from geese or ducks. Focus on better quality goose down as the duck.
Rapport duvet/plumettes :
A percentage is specified to give the fluff and feathers poucentage used (example: 80/20 means that the lining is made of 80% down to £ 20 feathers). The use of feather is indeed essential to ensure the best power down the swelling. the feather rate is variable depending on the type of down used.
Swelling power :
This is the volume occupied by a given amount of fluff. The swelling power is measured in Cuin. The Cuin (cubic inch) expresses the volume in inches (16,39cm³) occupied by one ounce of down (28,35g). Plus the value of Cuin, the higher the fill power is important. The values range from 500 to 900 Cuin Cuin.
Advantages of down:
-Very high thermal insulation
-Report weight / heat
-Long life expectancy
-Highly breathable (prevents sweating)
-Low moisture resistance
-Report price / temperature
-Not recommended for allergy sufferers