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Although the NeoAir has been around for about a year-and-half, I don’t think enough of you know about The newer XTherm. Offering a R value of 5.7 it is the equivalent of stacking a Z-Lite and two standard military inflatable sleeping pads. All that at only 15 oz (430 g). Also, note it is available in four different lengths.
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One important thing to note on the NeoAir is that it should be placed inside a sleeping bag. This not only increases comfort and insulation but also durability. Since it relies completely on air and a reflective material for insulation, it deflates much more quickly than foam lined pads and can be left inside your bag or bivy and stuffed for transport. The NeoAir does require a little more care than the standard pad but the advantages far outweigh the requirement to look after your kit.
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Here you can see it paired with the UltraLite Cot which weighs just under 3 lbs.
www.thermarest.com