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How to understand the EN 13537 Temperature Ratings. All of the temperature values are based on the air temperature outside the sleeping bag. Weather forecasts usually give two temperatures, the daytime high temperature and the night time low temperature. The night-time low temperature will be the air temperature outside the sleeping bag as you sleep. The EN 13357 temperature tests use a thermal manikin which is a full size humanoid dummy with heaters and temperature sensors. The manikin is placed inside the sleeping bag and both are placed in a climate chamber. The manikin is heated to simulated body warmth. The air temperature is measured in the climate chamber and on the skin surface of the manikin. From these measurements, the insulation value of the complete sleeping bag is calculated. The temperature recommendations are defined by EN 13537 based on the measured insulation. EN13537 produces four temperature results - upper limit, comfort, lower limit and extreme. These give ratings for a standard man weighing 80kg and for a standard woman weighing 60kg. • The EN 13537 Upper Limit or Maximum Temperature is the highest temperature at which a ‘standard’ adult male is able to have a comfortable night’s sleep without excess sweating. • The EN 13537 Comfort rating is based on a ‘standard’ woman having a comfortable night’s sleep. • The EN 13537 Lower Limit is based on the lowest temperature at which as ‘standard’ adult male is deemed to be able to have a comfortable night’s sleep. • The EN13537 Extreme rating is a survival only rating for a ‘standard’ adult woman. “In the risk range a strong sensation of cold has to be expected and there is a risk of health damage due to hypothermia.” This is an extreme survival rating only and it is not advisable for consumers to rely on this rating for general use. The best guideline temperatures for purchase decisions are the TComfort and TLimit ratings