Robert Boesch

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Temperature interpretation

Perception of warth

The perception of temperature of human beings is very individual und subjective. It depends of many factors such as:

  • Sex (Females generally feel colder than Males)
  • State of exhaustion (an exhausted body feels cold fast)
  • Hunger (a hungry body feels cold faster than a well fed)
  • Experience (How used a person is to sleeping in a sleeping bag)
  • Influence of Alcohol

There are also objective measurable factors that have an impact on temperature perception while sleeping:

  • Wind-chill (always try to protect from wind!)
  • Insulation from the ground (on the ground the insulation gets compressed and looses its power. -> Whenever possible use a sleeping mat)
  • Humidity (wet climates feel colder)

Evaluation of temperature settings

Since 2002, a definition for temperature ratings on sleeping bags exists with the European Norm 13537.  Temperatures are rated with the help of standardised climate chamber tests.

Ajungilak cooperates with the Swiss EMPA and the Spanish Aitex institutes, to work out temperatures in accordance with the EN Standards.

Tmax - Tcomf - Tlim - Text
The range between Tmax and Tcomf is described as the comfort range. Between Tcomf and Tlim is the transition range, below this and down to Text is the risk range. Tcomf can also be understood as the comfort limit for a woman and Tlim as that for a man. Above these temperatures, the average woman or man can sleep without stress or shivering. The extreme temperature Text can only be tolerated for a limited time of 6 hours. However, the bottom line is that these are just laboratory values. Temperature information should not therefore be understood as guaranteed values. It is intended purely for reference and to allow a relative comparison of different sleeping bag models.

Strong feelings of coldness should be expected in the risk range (blue). There is a risk of damage to health as a result of hypothermia.

Example values: