Reflectix under sleeping pad?

[Heavy Duty]

Do any of you sleep with a section of reflectix material under the sleeping pad to increase warmth?

[Scoutergriz]

Been doing it since it came out decades ago, it's completely waterproof and adds about R4 to your sleep system. You need to cover it with silicone dots to stop it from sliding though.

[Heavy Duty]

Been doing it since it came out decades ago, it's completely waterproof and adds about R4 to your sleep system. You need to cover it with silicone dots to stop it from sliding though.

Good idea. I didn't think about it being slick under the sleeping pad.

[jimmay]

I have found that reflectix will trap condensation in the bottom of my sleeping bag unless I put something between it and my bag. I usually place it inside on the bottom my MSS bivy bag then my Therm-A-Rest self-inflating foam pad on top. As pointed out they are slippery and will need something to keep you from sliding off. Back in my early hammocking days, before I had an underquilt, I used a Hennessy Hammocks Heat Reflecting Double Bubble Pad, (sucks in a hammock by the way) and I now use the same pad for winter camping if I do not use a Therm-a-Rest Z Lite SOL when it is really cold.

[jimmay]

I should add that Reflectix is only rated at R1.08 against conductive heat loss. If it has a sealed air gap between it and the warm space then the R value will then go up in relation to the size of the gap as it also become a barrier to radiated heat. An open cell inflated sleeping pad will gain an insulation benefit from Reflectix on the bottom if it has no circulation from cold air, where as with a closed cell foam pad Reflectix will give minimal benefit. https://www.reflectixinc.com/about-r...bout-r-values/

[Scoutergriz]

any non- porous pad will stop evaporation, and yes it goes under the regular pad for 2 reasons; it helps stop radiant transmission to the colder surface below because it is an "absolute" barrier (reflective rather than absorbent), and the other reason is to "airgap" it. Reflectix requires airspaces both above and below for maximium efficiency. there is sufficient airspace in both the conventional pad, and the cot or snow beneath you for it to approach that efficiency.