| How To Stay Warm Heat loss due to respiration (expelled warm breath) an be reduced by use of the bug net to help hold the arm air near the body. Yes, bug netting is a vapor ,arrier, just not a very good one. It is good enough, r-iough, that it should be vented as necessary to prevent v-e buildup of excessive humidity. Exhaling inside a zeeping bag should be avoided since it adds unwanted ater moisture to the insulation. Fabric color, although seldom considered in sleeping bag manufacture, also affects radiant heat transfer. Everyone has noticed that a black or dark-colored shirt "absorbs" more of the sun's radiant heat on a sunny day than a white or light-colored shirt. The dark fabric simply transfers much of the sun's radiant heat to your skin, while the light fabric reflects much of it back toward the source, which is the sun itself. Since you are the heat source in a sleeping bag, using light-colored fabrics around you will reflect more of the heat back to you while dark fabrics would allow more of it to escape. This is probably the real reason Poplar Bears are white!Highly reflective aluminized fabrics can work even better since they can reflect as much as 97% of the radiant heat back to the source! See more on these unique fabrics below.
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