On the market there are three types of marketed formats:
sarcophagus (also known as cocoon)
Rectangle (similar to a commercial envelope)
hybrid (also popularly called mixed)
The sarcophagus format is widely sold and marketed with your use recommended for colder locations.
By your drawing like a cocoon (or sarcophagus) hinders the heat exchange with the outside environment.
For people restless during sleep may not be as comfortable.
The rectangular shape keeps you warm in a manner less efficient and generally has low compressibility.
For who is restless during sleep, feel more comfort while sleeping.
The hybrid format is an attempt to make the rectangular format more efficient to retain internal heat.
It’s not a format sold widely, since merging the format has two previous but can’t extend the best of its properties.
Lining or Filling
There are two types of liner in a sleeping bag: synthetic fiber and goose down
The use of this fiber has the advantage of:
Has reduced cost
Is not affected your power of isolation in case of wet
Has as disadvantage have high ratio of weight and volume
Basically consists of hollow micro-filamentos form clumps.
These thin wires can store the air, making the heat exchange.
The most well known models of synthetic fibres are: Hollofill (the most common), Polar Guard (more durable and less comfortable), Prima Loft (Species of Polar Guard more flexible).
Make use of sleeping bags with synthetic fiber is required for any outdoor activities that practitioner is vegetarian for not making use of animals for your construction.
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