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<blockquote data-quote="Litehiker" data-source="post: 1494917" data-attributes="member: 54178"><p>Lion,</p><p>The VBL (Vapor Barrier Liner) thing is something you need to GOOGLE. VBL clothing is worn in very cold temps like 5 F. and lower but VBL boot liners are common to keep boot insulation dry from 30 F. down B/C we sweat a lot in our fees and CANNOT vent our boots as we can out pants, parkas and hats. </p><p></p><p>Also VBL clothing is used when sleeping (full suit) to prevent our body moisture from building up n our sleeping bags night after night until the bags have lost a lot of insulation and gained a lot of moisture weight. Read about the ill-fated British Scott South Pole expedition where their down "sleeping robes" accumulated so much moisture (and froze every day) that they could barely melt their way into them. Everyone in that expedition died of hypothermia!</p><p></p><p>Eric B.</p></blockquote><p></p>
[QUOTE="Litehiker, post: 1494917, member: 54178"] Lion, The VBL (Vapor Barrier Liner) thing is something you need to GOOGLE. VBL clothing is worn in very cold temps like 5 F. and lower but VBL boot liners are common to keep boot insulation dry from 30 F. down B/C we sweat a lot in our fees and CANNOT vent our boots as we can out pants, parkas and hats. Also VBL clothing is used when sleeping (full suit) to prevent our body moisture from building up n our sleeping bags night after night until the bags have lost a lot of insulation and gained a lot of moisture weight. Read about the ill-fated British Scott South Pole expedition where their down "sleeping robes" accumulated so much moisture (and froze every day) that they could barely melt their way into them. Everyone in that expedition died of hypothermia! Eric B. [/QUOTE]
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