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Condensation in a Gortex Bivy Bag???
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<blockquote data-quote="jmden" data-source="post: 537210" data-attributes="member: 1742"><p>Gore-tex is very easily 'overpowered' in terms of how much water vapor it can move through it. </p><p></p><p>That is why jackets, for instance, made with fabrics with gore-tex or other waterproof/breathable (w/b) laminates include 'pit zips'. Opening up these big zippers under your arms help you eliminate body vapor/moisture. Gore-tex works well as long as you aren't overheating enough to overpower its ability to transport watervapor through the membrane. </p><p></p><p>The newer generation of Gore-tex XCR was made about 25% more breathable than the older version to help with this issue, but it is still easily overpowered if you work much at all. Just depends on how hard you are working/perhaps what kind of shape you are in vs. the ambient temp/wind/etc. If it's hot outside and you get in the bivvy, you will likely be quickly releasing more watervapor than the bivvy sac can transport.</p><p></p><p>Many find Gore-tex too waterproof and not breathable enough when it's ability to breath is placed on a continuum from completely waterproof on one end to completely breathable on the other. Many manufacturers have gone seeking more breathable alternatives to keep their customers more comfortable. But, it is typically a pretty reasonable w/b laminate to use in a bivvy sac as you typically aren't running up the mountain while in a bivvy sac. Just very dependent on conditions as too how well it will 'perform'.</p></blockquote><p></p>
[QUOTE="jmden, post: 537210, member: 1742"] Gore-tex is very easily 'overpowered' in terms of how much water vapor it can move through it. That is why jackets, for instance, made with fabrics with gore-tex or other waterproof/breathable (w/b) laminates include 'pit zips'. Opening up these big zippers under your arms help you eliminate body vapor/moisture. Gore-tex works well as long as you aren't overheating enough to overpower its ability to transport watervapor through the membrane. The newer generation of Gore-tex XCR was made about 25% more breathable than the older version to help with this issue, but it is still easily overpowered if you work much at all. Just depends on how hard you are working/perhaps what kind of shape you are in vs. the ambient temp/wind/etc. If it's hot outside and you get in the bivvy, you will likely be quickly releasing more watervapor than the bivvy sac can transport. Many find Gore-tex too waterproof and not breathable enough when it's ability to breath is placed on a continuum from completely waterproof on one end to completely breathable on the other. Many manufacturers have gone seeking more breathable alternatives to keep their customers more comfortable. But, it is typically a pretty reasonable w/b laminate to use in a bivvy sac as you typically aren't running up the mountain while in a bivvy sac. Just very dependent on conditions as too how well it will 'perform'. [/QUOTE]
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Condensation in a Gortex Bivy Bag???
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