Adding warmth with a liner
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(warning some of this entry is R rated)
We get quite a few questions via 'Ask Baz' regarding how many degrees a thermal liner will add to a sleeping bag. On the face of it, a fairly straightforward question; but the answer can be complex. Here's why:
Sea to Summit offers three thermal liners; the Thermolite Reactor, the Thermolite Reactor Compact Plus and the Thermolite Reactor Extreme. All three are made of Thermolite, which is a hollow core fiber; this plus the three dimensional knit structure helps to trap air which insulates you. The Thermolite Reactor is made of 80g/m fabric, the Reactor Extreme of 110g/m fabric, and the Reactor Compact Plus of panels of both fabrics.
The Thermolite Reactor is rated as adding 'up to 14F / 8C'. So will it add 14F / 8C to your sleeping bag?
This depends on a number of factors including your own metabolism (you may be a 'warm' or 'colder' sleeper), and your condition (you may be well fed and rested on one occasion and tired and hungrier on another).
But it also depends on the design of your sleeping bag and its actual temperature rating,[url=http://www.burberryoutletonline.in.net/]burberry@#$%&[/url].
Design points of sleeping bags which affect performance include how well the draft tube covers the zipper, how effectively the hood seals around your head,[url=http://www.oakleyvaultsunglasses.us@#$%&/]oakley holbrook[/url], and whether or not the insulation is prevented from shifting (and whether it has deteriorated into clumps and gaps). All these things cause heat to 'leak out' of a sleeping bag.
Temperature ratings are an even bigger issue: in the US, manufacturers are free to claim whatever 'rating' they choose for a sleeping bag. It is not standardized at all (no matter what store staff and bloggers may suggest). The European Union EN 13537 rating system is becoming the standard in the US this uses heated mannequins dressed in a standard base layer in a sleeping bag,[url=http://www.pradaoutletonlineb@#$%&/]prada bags[/url], tested in a climate controlled chamber. The ratings ('Lower' for a male sleeper and 'Comfort' for a female sleeper) are therefore objective and consistent across brands.
So: in one instance (to answer a customer service email), we checked on a brand name bag which was marketed as "Zero F" the EN Rating for this bag is 10F for a man and 23F for a woman.
Given this it's very difficult to guarantee a particular performance plus from one of our liners. In situations below 32F, the ground may have frozen (here in Colorado, the ground in the backcountry freezes in early October). So while the air temperature overnight may drop to 25F,[url=http://www.lululemon-outlet.us@#$%&/]lululemon headbands[/url], the ground may have been closer to 15F for days.
In these circumstances, your sleeping pad is an extremely important component in your sleeping system. You should check the insulation value of a pad its 'R' Value before you buy it. For summer use, an R value of 2 is sufficient. For early Fall an R Value of 3 will be necessary, and for late Fall you may need a 4. Winter camping requires a 5.
No matter how good a thermal liner may be,[url=http://www.montrepas-cher.fr/]montre guess[/url], it cannot compensate for an inadequate sleeping pad.
Sea to Summit always strives to provide realistic performance data for all its products. A Sea to Summit thermal liner will definitely add warmth to your sleep system hopefully, the above information gives a sense of how many factors need to be considered in answering the question 'how many degrees will this liner add to my bag'?
Any further questions,[url=http://www.soccershoes.us/]mercurial vapor[/url], please just ask.
I not sure if you heard directly from my colleagues in Perth,[url=http://www.montblancpens.us/]montblanc[/url], Australia,[url=http://www.sac-longchamps.fr/]sacs longchamp[/url], so here the story with the Reactor footbox.
The very end panel of the liner is a trapezoid shape which measures approximately 12 / 30cm across the top, and 10 / 25cm for the sides and base. So the circumference measures 42 or 105cm.
However the knitted fabric of the liner is so stretchy, that it will stretch and move with you as you sleep you simply won notice it. (This is different from a silk liner which is woven, and thus has very little stretch at all).

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