The sleeping bag is part of the paraphernalia of basic trekker. If a simple lightweight bag or a sleeping bag, enough for the nights in refuge or rest house, choosing a suitable bag is essential if you sleep in a tent, especially if you go on trek altitude.
Rollover image below to see the key points:
The head is, as well as the feet, the first heat loss area (nearly 30%). So you need a hood fits snugly. For this test the effectiveness of the clamping system (or other cords). Finally, note that the hood works, mostly in conjunction with the shoulder collar for perfect insulation of the upper body.
With a Velcro closure and a drawstring, the collar helps clog the only area of communication with the outside cold. Ideally, it can be manipulated with one hand. Always to fight against cold feet area generally has a more substantial insulation.
The Temperature Index
According to their heat capacities, sleeping bags are divided into four programs: one, two, three or four seasons.
-The “season” very light and mostly synthetic, have a very limited use. The “two seasons” a little more efficient, will do throughout the spring, but in temperate zones.
-The “three seasons” cover for their most trekking needs, with a range of use relatively wide, from March to November. It is their comfort temperature around 0 ° C to plus or minus 5 ° C of. Nevertheless, they find their limits in the heart of winter, when temperatures blithely pass the zero bar.
-The “Four Seasons” are thus complete the picture with +/- comfort temperature 10 ° C. Cut for the toughest conditions, some of them even offer the total well-being by -30 ° C.
-Natural packing (feather and down) offer exceptional insulating qualities due to its swelling power. It is also very light, very compactable and especially ultra-comfortable. But once wet, feathers lose their insulating. According to Pimasleepingbags.com, sleeping bags with down are lightweight and more expensive.
-Sleeping bags with synthetic insulation are certainly less comfortable, less efficient, less compacted, heavier, but they are not afraid moisture, hollow fiber component being hydrophobic.
The sarcophagus form of sleeping bags are much more appropriate than the so-called bags “open” for effective thermal insulation, since they guarantee maximum tightness and allow to shelter the head, this being the first of the flight zone body heat. The slim cut and near the body greatly limits the flow of air.
The rails are often the Achilles heel in terms of airtightness. A quality bag must be equipped with flaps above and below the closing zippers. With flaps, no worries. Some bags are twinned (left or right). To watch to purchase.
To get a good sleeping bag, it is not enough to simply fill an upholstery fabric envelope because it would quickly settle down in some areas, creating thermal bridges through which performs heat loss. Thus, more compartments (or boxes) are numerous, better packing remains in place and it is effective.
An important criterion in voting choice!
-In length, your shoulders should be fully encompassed by the shoulder collar, so you need to keep some room at both ends (do not hesitate to exaggerate your size, it is always great when lying down, never sleeps feet square).
-For the width, find the right balance. Too narrow, you can not move inside; too large, time to warm you will be longer and the risk of greater heat loss.
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