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EN 13537 (or EN13537) is a European standard designed to standardize the temperature ratings on sleeping bags manufactured and/or sold in Europe. As of 1 January 2005 a CEN criterion came into effect covering the testing and publication of temperature ratings for sleeping bags. The new criterion differs from the standards that existed formerly.
So that practical clothing may be described conveniently by a range of small integers, the unit of thermal resistance, to be called the “tog”, is the resistance that will maintain a temperature difference of 0.1°C. with a flux of 1 watt per square metre, or in more practical terms, 10°C. with a flux of 1 watt per square decimetre.
A sleeping bag's test rating is based on a person who is wearing long underwear, socks and hat, and is sleeping on an insulated pad with an R-value of approximately 5.5. [ citation needed ] There is no standard measurement rating in the U.S., so a 20 °F (−7 °C) bag from one company may not provide the same warmth as a 20 °F (−7 °C) from ...
Temperature influences the body’s circadian rhythm, which regulates sleep-wake cycles, says Dr. Vendrame. In other words, your body’s temperature tells you when to sleep and when to be awake.
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Calculations based on fill power and loft are only approximate. The warmth of sleeping bags may be more accurately compared using European Norm temperature ratings that are based on realistic independent laboratory tests. The rated temperature (in degrees Celsius) is the lowest comfortable temperature.
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A sleeping pads's warmth is characterized by R-value. But unlike sleeping bags' EN 13537 test standard and widely accepted recommendations, sleeping pad R-values lacks a simple mapping and label for 'how much warmth' a consumer should expect. Combining various standards and various authors' research, an approximate R-value to temperature chart ...
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