Sleeping Bags of the New Millennium

At the beginningAt first, a sleeping bag was merely a blanket you wrapped around yourself. Because of technology zippers were made. Clearly the next advancement in the sleeping bag world happens to be a blanket which can be closed up with a zipper. It may seem by taking a look at a sleeping bag in today's market that not much has been altered mainly because a sleeping bag still generally looks like a blanket that has a zipper up the side right? wrong….
It's what's within that countsWithout a doubt, sleeping bags are no longer just a blanket. Companies have invented double layer fabrics which are filled to come up with an insulation pocket you sleep in. Various manufacturers stuff this pocket with different materials. Some examples are "high loft European downs" and synthetics much like "DuPont Thermolite" and "Powerloft 3D". Basically this can be narrowed down to two kinds, down and synthetic. 
These materials are improving on a regular basis, at the moment a material similar to "Down" which can get wet and still keep it's warmth is being formulated. This will be another great innovation once it works..
Resilient exteriorAs fabric technology develops so does the outside of the sleeping bag framework. Products like super strong nylon and polyester are put to use. This has developed to breathable fabrics and fabrics that resist tears and ripping.
ProgressionJust how much has sleeping bag technology progressed? Were you aware that you can have a sleeping bag that you could use like a full body jump suit. This brilliant design mixes mobility and comfort. As you put on the bag like a jump suit you'll be able to move about easily, run away from emergency situations even rise up in the middle of the night without the need to step out of your sleeping bag.
Weather ConditionsDifferent people bring about completely different body heat. That is why sleeping bags have several different temperature ratings. It's encouraged that you pick a bag using the coldest environment you're more likely to go to. The work of the heat retaining material within your sleeping bag is to produce a barrier between the warm air that your body heat generates and the cold air outside the bag. The denser the barrier the warmer the bag would be. 
Down is probably the most efficient insulation for it’s weight and packed size on the other hand it is furthermore the more expensive, so it is perfect for bushwalkers, trekkers and also travellers. A possible problem with Down is that when it gets wet it will not retain its thermal properties.
Synthetic insulations are actually measured in grams for every square metre and the more filling the warmer the bag is going to be but it will also be heavier and bulkier.
Science says - It will all depend on youEven when factors such as wind chill, climate, your ability to tolerate cold, your fitness levels can certainly have an effect on your capacity to be warm in winter weather, what you sleep in is the most important factor to take into consideration with regards to enjoying yourselves in the great outdoors. 
Research your sleeping bag thoroughly and enjoy a good nights sleep.