page_title: Sleeping bag
section_title: Temperature ratings
hierarchical_section_title: Sleeping bag / Temperature ratings
caption_attribution_description: Čeština: Knihovna Třinec - oddělení pro děti
context_page_description: A sleeping bag is an insulated covering for a person, essentially a lightweight quilt that can be closed with a zipper or similar means to form a tube, which functions as lightweight, portable bedding in situations where a person is sleeping outdoors. Its primary purpose is to provide warmth and thermal insulation through its synthetic or down insulation. It also typically has a water-resistant or water-repellent cover that protects, to some extent, against wind chill and light precipitation, but a tent is usually used in addition to a sleeping bag, as it performs those functions better. The bottom surface also provides some cushioning, but a sleeping pad or camp cot is usually used in addition for that purpose. The bottom surface of a sleeping bag may be moderately water repellent, but a plastic tarp or groundsheet is often used to protect against moist ground.
  There are a range of sleeping bag models designed for different purposes. Very lightly insulated sleeping bags are designed for summer camping use or for indoor use by children during slumber parties. Well-insulated bags are designed for cold weather use.
context_section_description: In Europe, the EN 13537 standard (introduced in 2005) normalizes the temperatures at which a sleeping bag is rated for use. In March 2010, REI began requiring American manufacturers to follow the EN 13537 standard, and in October 2016, ISO 23537-1:2016 standard replaced the EN 13537 standard.
  TheA test, relying on a heated mannequin, provides four temperatures:
  the upper limit is the highest temperature at which a 'standard' adult man is able to have a comfortable night's sleep without excess sweating.
  the comfort rating is based on a 'standard' adult woman having a comfortable night's sleep.
  the lower limit is based on the lowest temperature at which a 'standard' adult man is deemed to be able to have a comfortable night's sleep.
  the extreme rating is a survival only rating for a 'standard' adult man. This is an extreme survival rating only and it is not advisable to rely on this rating for general use.
  The transition zone, in between the comfort and lower temperature, is usually considered as the best purchase guideline.
  A sleeping bag's rating typically indicates the lowest temperature at which it will keep the average sleeper warm. For example, with a 0° bag, a person should be able to sleep in 0° temperature, but not necessarily comfortably.
  There is no standard measurement rating in the U.S., so a 20° bag from one company may not provide the same warmth as a 20° from another company. Other important variables include what the user plans to wear while sleeping, what type of sleeping pad is used, and how well the user holds heat in the bag.
  It has been shown that moisture (either externally, or from sweating) severely decreases the insulating effect of sleeping bags.
caption: Girls with sleeping bags at a sleepover.
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