It is important to understand that in a sleeping bag is not any heating element, i.e. it does not heat. Its function is to achieve an optimum temperature to sleep in a nice position, thus preventing the heat generated by the body itself escaping abroad. It is basically an insulating element which should ensure maximum possible isolation, even in the most extreme environmental conditions. For this reason, according to the place in which it is to use the sleeping bag, the requirements will be more demanding. It is not the same to sleep in a tent in the high mountains that sleep in a shelter, make bivouac or use the sleeping bag at a campsite at the level of the sea.
Types of filling material
Sleeping bags filling is the most important factor to determine the degree of insulation that can be achieved, according to localbusinessexplorer. Two main groups of packing materials can be:
- Down and feather
- Synthetic fiber
Called pen bags contain a variable proportion of down and feather blend. Bags containing greater amounts of down are the highest quality and manage to, keep body heat in the interior of the bag in the most extreme conditions. Both the down and feather are natural materials, called down to the pen that is more attached to the body of the bird and has a smaller size and is thinner than the conventional pen. These characteristics of down make the isolation that produces more and more homogeneous that which produces pen, being also a lighter material.
In sleeping bags, down and feather come almost always goose or geese and their quality increases with the age of the bird. It is common to refer to down bags as bags of feathers and in identifying the quality of them is essential to verify the proportion of down they have, as this can be really different. Thus, when it comes to a 90/10 sack is becoming reference to a fill containing 90% down and 10% Feather, which is a high quality bag. In the case of a bag of 50/50, the proportion of down and feather is identical and the quality is lower. Highest proportion of down bags are the highest quality and that are used in the material’s high mountains, but they are also the most expensive.
Bags of synthetic fiber
Synthetic fiber used in the filling of sleeping bags is an artificial imitation of natural down. In this case, each manufacturer provides its own product and describes their characteristics. It is, in general, of polyester fibers.
Although high-quality synthetic fibers have been developed, in general this type of filling is heavier and less insulated than the natural.
Other aspects related to filling material
Once the material that will be used as filler has been identified, it is necessary to take into account other considerations.
Thus, the amount of filling is a determining factor, then how much more there is better will be the insulating ability, but the greater its weight. It is also necessary to consider that, according to the quality of filling, the amount needed to achieve an effect which can be considered equivalent can be very different.
The way to distribute the filling inside the bag or tabicado is also an important aspect, implying the existence of seams that are points of heat loss. Different manufacturers offer different forms of tabicado to try to optimize the distribution.
The so-called recovery or expansion capacity is a factor to be considered in the down and feather filled. Measures the ability of expansion of this type of filling (synthetic fibers no expandability) inside the sack, so the greater, the greater its insulating ability. This ability, which can only be attributed to the down, is measured in cuins. In bags of feathers indicated the number of cuins that have padding, so if its value is less than the 500 cuins is a poor filling and if you exceed the 700 is a high quality filling.
How to identify a sleeping bag insulation capacity.
It is important to know that the requirements that comply with a sleeping bag are standard, existing ways of measuring the insulation which are different in Europe and America. Sleeping bag label must appear listed a series of parameters that allow that user can know the filling characteristics and temperature ranges that can withstand the SAC, being the comfort temperature the maximum to which a man can sleep without feeling of cold, the temperature limit at which a woman can sleep in fetal position and extreme temperature that provides protection against freezing.
With all this, it is possible to identify the sleeping bag that is needed for each specific use.