The "R value" is the same number you see on a roll of pink insulation at the home improvement store. Roughly speaking, an R value of 1 provides about 11 degrees of insulation. So if you get cold at 70, an R 1 pad will keep you warm down to about 59.
"Radiant" is what Reflectix is. It is a radiant heat barrier. I blocks the emission of heat via radiation.
If I say a "16 degree solution", I mean that an average person will remain warm to 16 degrees F.
There are three types of heat transfer: conductive, convective and radiant. All of them apply to hammocks.
Reflectix stops radiant heat loss with the aluminized outer covering. It stops convective loss by being wind and water proof. Conductive heat retention is accomplished with its R value.
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