The padding for sleeping bags are mainly two: duvet and synthetic. The differences between these two pads are not insignificant, and it is good to choose carefully.
Sleeping bag in feather: the duvet, distinct from feather filler, is a very specific part of the mantle that covers the geese or ducks, and there are various types. I make here a summary of the most important things to know. The high quality comforter is currently stuffing lighter and with greater insulating power there is. The insulating foam is expressed in CUIN. The down-filled sleeping bags are extremely compressible and lightweight, and compression will not affect the health and insulating capacity, it is also a padding that if well treated and washed as it should last even 15-20 years. The breathability offered by this padding, then, is one of the best: the water vapor of perspiration passes and the heat remains. The main against the having in bag down are that should not be wet or it will lose up to 80% of the insulating power. This factor, not knowing how to wash it and ethical choices they prefer sometimes the sacks in concise and divided between those who love the bag feather and who avoids it. [In Top-medical-schools.org, I have addressed in detail and summary European law that regulates the labeling of duvets, how to measure the insulating power of down jackets, specifically such as duvet padding there and every other aspect riguradante this type of insulation in the dedicated to quilts page.
Sleeping bag synthetic: lots of sleeping bags have padded fabrics and fibers, PET fibers to expensive but excellent latest generation, who are making a difference and have more and more success. Treat them all is impossible, in particular reviews the padding of each lot. In general we can say that the synthetic sleeping bag too warm, wet, keeping about 71% of the insulating properties, and dries very quickly. Conversely weighs more, it is less compressible – then takes up more space in your backpack – and heats a lot less than in the duvet. But these are generic data and comparisons van made case by case. The new fibers used to stuff sleeping bags, such as hollow fibers, ultra-thin fibers are estrememente efficient. Materials such as Trinsulate comes to be 40% heavier but also 1.5 times more insulating down jacket – for the record fairness, I must add that I have never found specified which duvet!
In short, between pro and cons has long being a sort of war to the greater efficiency of synthetic sleeping bag and sleeping bag or duvet comforters.