>>196185Now let's get into more detail:
- If you're taller and/or fatter than dummies, you'll better keep your warmth, but it will also take more time for you to gain heat. Overall, unless you're in a survival situation, you'll be at an advantage.
- The exact R-value of the sleeping mat is sadly unknown. Based on amateur tests, it isn't a good sleeping mat.
- Which brings this problem: some down sleeping bags are poorly evaluated by this test, because down is highly compressible, and the part of the sleeping bag that is under the body performs poorly, much worse than synthetic insulation would. Which means, down sleeping bags are at a serious disadvantage considering the poor insulation provided by the sleeping mat used.
Which is why some down sleeping bags actually have a synthetic under layer, and also why quilts and top bags exist, which is a good reason to ignore those that have a completely useless down under layer, but it nonetheless makes data for those sleeping bags irrelevant past -10°C/14°F temperatures, seeing as they're supposed to be used with decent air pads, not just a foam pad.
- Clothing is another unknown, we don't know much about the specific underwear used, but it's a good thing it's only underwear, as it gives you performances closer to what the sleeping bag can really achieve on its own, rather than what it can achieve if you put some efforts on your side. Of course, at temperatures below -10°C, no one would sleep in just his underwear.
- Air moisture is yet another unknown. All we know is that dummies don't sweat: take that into account.
