It was clear that all variables were unchanged except for the daytime/nighttime temperature swing.įor those interested in such things, Casey's calculation on loft can be a good starting point… However, for the numbers to be accurate that calculation assumes that the amount of down is going into the same-cut sleeping bag shell & that the shell fabric is the same weight. The R-8 pad, sufficient for subzero *F temperatures, was the pad I used on the cold-sleeping night in the teens.
#Kelty cosmic down 20 pro#
The two pads I used for testing were the Thermarest Women's Trail Pro (R-5.1) & Exped DownMat 9 (R-8). The point, of course, is that to determine if a manufacturer's rating is accurate, it wouldn't be appropriate to use a lower R-value pad than they use for testing. I can't find the post right now, but I seem to recall these numbers being supported in another thread by Mr. Ken Strayer noted that EN standards for testing at 20*F use an R-5 value pad by comparison, R-2 for 50*F and R-3 for 40*F. Also note that there have been some great threads correlating sleeping pad R-value to temperature & sleeping bag rating. If I had used a lower-rated pad, I wouldn't have had a good comparative baseline.
While realizing that some people on BPL use low-rated R-value sleeping pads, for example, I used the same pads I always do. Thanks for your responses! I'm glad this piqued some interest, & hope it helps out more people.Ī few comments about the discussion… Field testing a sleeping bag for relative/comparable warmth is an inherently subjective undertaking, so I eliminated as many variables as possible.
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