With a relatively low weight, sleeping bag lets you be warm and well despite a cold nights at altitude. Sleeping Bag Prices vary depending on the ratio higher thermal properties and weight, so it would be advisable to waste five minutes to read this article.
The principle of thermal sleeping bags are based by maintaining a layer of air which circulates around the body. This air is heated by body temperature, and the bag forms a barrier between the air and ground or air cooler outside. As less air is heated to warm up even faster, while it also helps keep warm air better.
Temperature Classification bags
Classification method is not standard sleeping bags (or at least is not measured by standards in all sleeping bags) and in this case indicated temperatures in some bags might differ from reality. Comfort temperature is the temperature at which a sleeping bag will keep you warm an average individual (statistically).
These classifications, even the standard can vary depending on your metabolism copra. For example, they differ from women to men (women are on average colder than men). It is best to take these rankings as a guide, not as guaranteed.
Classification methodology and temperature according to EN
Norm EN 13537 is used for temperature classification. This test protocol is already in use for several years in Europe.
Temperatures indicated on sleeping bags, according to Standard EN 13 537 are calculated with a model equipped with temperature sensors and heaters imbract with long sleeve shirt, trousers, hat and knee arrives. This model is similar heated to human body heat and the measurements are made from the skin dummy.
Using this methodology produces rankings of temperature in which you can trust and help you compare sleeping bags produced by other companies under these standards.
Factors affecting body temperature
Besides sleeping bag, the following factors could influence the warmth and comfort:
Isoprene (insulating sleeping mat) – insulate the space between your bag and soil some sleeping bags on the mattress may be the only insulation between the body and soil
Tent – use a tent or bivouac bag adds an extra layer of air does not circulate, increasing the temperature by another 5 to 10 ° C.
The metabolism of the body – can be cold or you can become hot faster than others
Gender – women generally prefer the warmest sleeping bags
Clothing – what you wear inside the sleeping bag can make a difference (excempl: vs. tights. Pants polar)
Cases – hooded sleeping bags can be useful for cold nights that retain heat better in the head
Hydration – hydration status may affect body temperature (hint: hot drink before bed)
What temperature classifications to choose?
Sleeping bags that meet EN standards can provide confidence, comfort in having the correct temperatures. For those who have not set these standards will be recommended to take a margin of 2-3 ° C.
In all warm nights sleeping bags you can always add ventilation using a double zipper opening bag at his feet, or using it as a blanket, with all the open zipper.
Below you will find some basic rules about sleeping bags are categorized:
Bags Summer minimum comfort temperature over 1 ° C
Bags 3 seasons: the minimum comfort temperature between -12 ° C and 1 ° C
Cold Weather Bags: minimum comfort temperature between -20 ° C and 12 ° C
Bags / winter temperature extremes: the minimum comfort temperature below -20 ° C
Sleeping bags female
In recent years women’s adapting sleeping bags has increased dramatically. These bags are especially designed to meet the contours of the female work. Compared with men sleeping bags, the female usually have the following characteristics:
May Proportional grade around the thighs
Strong thermal insulation at the top and the legs
Thermal Insulation: down or synthetic?
Thermal Insulation sleeping bag (filled) do not produce heat, instead work by minimizing heat loss that occurs in your body while you sleep. For this there are two common types of thermal izoloatie: down and synthetic insulation (synthetic fibers).
Fluff is used in sleeping bags of ducks and geese, collected on their belly. This natural fiber is a great insulator. High quality fluff is usually collected from geese because their fluff provides greater coverage. Coverage refers to the number of cubic centimeters occupied by one gram of fluff. As higher the number, the less need to get down to the desired temperature classification. Because the spray is not found everywhere, usually the price increases with quality.
Looses fluff insulation properties when wet, so sleeping bags will use a high quality coating material treated to repel water (DWR). DWR’s water to help to slide rather than soak into the material. In addition, some treated with DWR special bags are waterproof and can be used in moisture without problems.
Synthetic insulation (synthetic fiber)
End synthetic insulation (usually polyester) retain more heat even when wet, so they are a better choice in humid climates. It dries quickly, is non-allergenic and quality bags can reach weights of the close down. Disadvantages synthetic bags is that it offers less weight compared with their thermal comfort, in addition to their insulating power decreases with each packing their bags in compression. There are several brands and technologies for this type of insulation, but the factors are whether the filament is short or continuous.
Synthetic fiber, filament short (eg. PrimaLoft) are the predominant choice. These filaments are densely packed to prevent heat loss. This makes the sleeping bag to feel soft and flexible, similar to a bag filled with down. Also it helps that its compression to be great, but have a disadvantage: they are less resistant over time.
Synthetic fiber, continuous filament (eg. Polarguard) is composed of a thicker continuous filament which has a high resistance. These sleeping bags provide a tougher feel and offers compression lower than those of synthetic fiber, filament short.
Other parameters of synthetic fiber should consider is how many holes exist if each filament and are filled with higher-insulated material (with holes inside the filament is called holofibra).
What insulation for suits?
For heating, compressibility and durability of down sleeping bags choose. Although more expensive, fluff make their long term investment merit.
For a lower price and choose a good performance synthetic fiber sleeping bags. The synthetic fiber, filament short offers excellent compressibility, while the synthetic fiber, filament short-cooler and more durable. Synthetic fiber is optimum for wet Mede.
Overview of heat loss
As I wrote above, sleeping bags insulate heat by a stiff layer of air which circulates around the body. The basic concept is balance hot-cold, sleeping bags trying to minimize the hot-cold balance by retaining body heat.
There are four types of heat loss that prevents them from sleeping bags:
convective (eg. currents of air)
radiance (eg. differences in temperature)
inductive (eg. temperature is transmitted from contact with a cold cloth – soil)
water vapor (liquid to vapor transformation and its evaporation).
Designers have to balance their sleeping bags ventilation parameters – compressibility – weight when taking into account the heat loss problems.