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Good explanations on the mylar, it is a plastic film that has gotten more credit than is due on it's reflectivity capability. It is light weight and that is one of the reason you see it used so often.
Some of our end users from Ak brought their 8oz BTR ( breathable thermal reflective) Liners down to the NTC and used them on the roofs of their Hummers and claimed it helped, especially with all the radio equipment inside. I wished they sent images of that in use but we got a few of the training.
It can be a delicate balance to use passive strategies to over come some very active effects... sometimes it can be done very well.
I probably will not do justice to the PHD's that explained the science to me but I'll give it a shot the direct energy from the sun is coming in long wave radiation the reflected energy is in short wave energy... I think of a Tromb Wall in Architecture as an analogy. Our Breathable Thermal Reflective material is a polypropylene sub-straight that has been aluminized, aluminum is much more effective but the real work is done by the insulation, as said the air space).
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"It is because they have so much to give and give it so lavishly...that men love the mountains and go back to them again and again." Sir Francis Younghusband
Essayons
By Dand
"In the school of the wilds,there is no graduation day"Horace Kephart
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