Quote:
I also plan to put down in net tubes and insert the tubes into the mat


I wonder if you could make a tube from two pieces of plastic material where the bottom half is reflective (shiny side up) and top half is net.

I think I read the Neoair mats use a reflective material, similar to a shiny "space blanket", inside their mat that is formed like a honeycomb. They also use a (somewhat) reflective bottom surface on them.

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