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  1. #1
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    Bottom insultation tempature question? Neo Air XLite?

    Hi,

    Would a Thermarest Neo Air XLite work for September in Shenandoah (lows in the mid 50's)? I'm an average sleeper, the bag temp normally matches my comfort zone. I'll be taking a HG Burrow 40 as my top quilt. When I try to search I come up with a lot of conflicting info regarding pads, and it's not always clear which temperature range people are talking about. I'm trying to avoid an underquilt because they're expensive and heavy.

  2. #2
    Senior Member Boston's Avatar
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    Warning, math ahead:

    1.75" of down is ~= to 6 CLO (based on a comparison between EN CLO comfort rating for 32*F, and generally accepted down loft for 30*F).

    1 R-Value ~= 1.135 CLO

    So 1.75" down has an R-Value of:

    6 CLO * 1 R-Value/1.135 CLO ~= 5.3 R-Value.

    For a 50*F temp rating you need 1.25" of down loft, which translates and an R-value of:

    1.25" down * 5.3 R-Value/1.75" down = 3.78 R-Value

    The NeoAir X-Lite has a listed R-Value of 3.2.

    Personally I feel that the generally accepted loft is on the low side (aka, need more loft for that temp), but I'm a cold sleeper. Either way though, I doubt the NeoAir X-Lite will get you to 50*f comfortably, unless you're a very warm sleeper.

    I have also found that I'm more uncomfortable if my top insulation is warmer than my bottom, vs the other way around. My body is used to my back being warmer, from year's of sleeping in a bed.
    Last edited by Boston; 07-29-2014 at 11:50.

  3. #3
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    Thanks, that was a much more detailed reply than I was expecting, useful math

  4. #4
    Senior Member Boston's Avatar
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    No problem.

    Now, that pad would probably be fine for 50*F on the ground, but heat transfer works differently in a hammock. You have to deal with convective heat loss to the air under the hammock. Convective heat loss is exponentially greater than conductive heat loss (that you'd experience on the ground), especially if the air is moving - like from wind.

  5. #5
    Peter_pan's Avatar
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    Temp wise the pad will be fine in Sept... The issue is, it will not be wide enough to keep your shoulders warm from the sides.

    Pan
    Ounces to Grams.

    www.jacksrbetter.com ... Largest supplier of camping quilts and under quilts...Home of the Original Nest Under Quilt, and Bear Mountain Bridge Hammock. 800 595 0413

  6. #6
    I just spent my first two nights in a hammock with the temps in the mid to high 50's with a 40 degree sleeping bag (cotton shirt and shorts and polar fleece hat) and a walmart sleeping pad and was plenty warm. I do feel like 50 degrees is going to be my limit but I think the weak spot is more the bag than the pad. I'll be testing the limits in the backyard as soon as the temps drop down a some more.

  7. #7
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    I found mine is too narrow and use a ccf pad instead

  8. #8
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    Decided to just make a 40deg down full length underquilt instead. 7oz of 850fp down, box baffles, and Momentum 90MR, I figure it should end up in the 14oz area, give or take an ounce. Now I just have to remember how to work a sewing machine...

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