ok, heres one for you. forgetting about convective heat transfer, reflective this, radiant that, how about say... having a red sleeping bag, is that going to make me even more hungrier in the morning when i get up. or, even more eager to hit the trail?
A color psychologist would probably tell you that: red is the color that makes people hungry. Red instantly attracts attention and it also makes people excited, energetic, and increases the heart rate.
functional? aesthetics? just wondering
sorry O P, might be getting 'off track' here a little