A companion that sometimes is critical is your sleeping bag, or sleeping bag. In stores you can find two different forms, in mummy or rectangular, and with natural or synthetic padding.
Let’s say firstly that there are EU regulations on the production of sleeping bags that manufacturers should follow, although I’m not legally obliged (but since 2005 a product with different standard temperature is considered misleading and therefore the manufacturers could be forced to withdraw the marketing). The first, EN 13538 of 2003, determines the dimensions (internal dimensions, thickness and springback, volume under load and ease of wrapping), the second, the EN 13537 of 2005, establishes the temperature requirements. We see the second one, which interests us most. But first I have to say that you need to understand the concepts of body heat, thermal equilibrium, production and heat loss, basal metabolism, sweating. If you go to the section techniques to clear up all items!!!
OK, made the necessary premise we see the legislation. The EN 13537 says that all sleeping bags produced by pimasleepingbags according to this European standard must be declared on the label corresponding to the temperature thresholds as verified by a laboratory test standard with thermal manikin, equal for everyone. This avoids the somewhat bizarre temperatures declarations and not scientifically proven. We introduce above all a standard: all sleeping bags with the declared temperature 5° Celsius, regardless of brand, weight and materials, have a protection from the cold.This standard does not apply to military sleeping bags and those for extremely cold climates, below 25 degrees Celsius below zero. This standard does not apply to sleeping bags for children, because the puppies have a particular perception and cooling control system, and very difficult to standardize (I read in a medical journal that a baby has survived after reporting an internal temperature of only 17° C, while already 32° C for an adult can be fatal!). The test is done with a special dummy, dressed in a long cotton lightweight undergarment (a slumber), with thermal sensors and heated to simulate the production of body heat, and the result is 4 temperature thresholds, indicated on the label with a design like this:
In the drawing you can see the 4 temperatures resulting from the tests according to EN 13537. They are, from left to right, the Highest, the Comfort, the Limit andExtreme. Let’s see what does.
Maximum is higher outside temperature at which an adult male standard is able to have a comfortable night’s sleep without sweating excessively (a sleeping bag open and arms out).
Comfort is the lowest outside temperature at which a standard adult woman is able to have a comfortable night’s sleep without interruption.
Limit is the lowest outside temperature to which an adult male standard is able to have a comfortable night’s sleep without interruption (approximately 5° C less than the female).
Extreme is the lowest outside temperature at which a standard female body is protected from hypothermia (but not from the freezing of the extremities) and manages to have 6 hours of sleep is not comfortable and not continuous.
Attention: it must be clearly stated on the label that the temperature was referred or that complies with the EN 13537, and the Chief must carry the CE logo!!! The design alone is not enough.