| Vapor Proof Treatments Sealing the fabric in this way for winter use effectively blocks some cold outside air from passing through the hammock fabric. It also helps keep the warm air inside. This helps stop the convective heat loss due to moving air (i.e., wind) through the bottom fabric. Once warm temperatures return, the vapor-proof treatments can be removed to allow cooling and condensation-preventing air to circulate once again. Sealing the bottom fabric however, does not stop the equally serious conductive heat loss due to contact with cold air. In other words, a warm body in the hammock will continue to rapidly lose bottom heat unless sufficient insulation separates the camper from the cold outside air. A
sleeping bag works fine by providing insulation on `.op, but it is compressed
by the weight of the hammock user and gives practically no insulation
on the bottom. \on-crushable sleep pads however, can effectively provide
the needed insulation
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