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<blockquote data-quote="Litehiker" data-source="post: 1240869" data-attributes="member: 54178"><p>Andy,</p><p></p><p>The neoprene divers' sox are closed cell neoprene, thus they form a vapor barrier. They usually have nitrogen filled bubbles inside them. </p><p>Your foot pressure on the neoprene sox is a bit similar to the water pressure divers experience and they do resist compression quite well. Still, for best warmth, you need a decent closed cell foam insole, preferably a moldable one for better comfort and support. </p><p></p><p>Hope this helps. As a former Nordic and alpine ski patroller I've found this system to be fairly foolproof and have used it successfully for over 20 years. </p><p></p><p>BTW, breathable SealSkinz sox do <em>not</em> fill the bill as a VBL. Breathable means they let sweat out - and into your boots' insulation. Wet insulation is compromised, cold insulation.</p><p></p><p>Just remember to dry the VBL sox at night and change liner socks. "Cleanliness is next to Godliness." ;o)</p><p></p><p>Studies show that your feet tend to actually sweat a bit less with VBLs because your feet sense they have enough sweat and cut back perspiration somewhat. It's similar to a sleeping bag VBL for extreme cold temps where the VBL causes you to sweat less. Wetting sleeping bag down from perspiration and breathing makes it heavier every night and bags can't dry B/C the dampness freezes in very cold temps. The ill-fated Scott South Pole expedition failed mostly due to frozen down bags, whereas the successful Norwegian expedition used reindeer hide bags which could have the frost shaken and beaten off. They also used skis for a faster transit, thus needing to haul less food.</p><p></p><p>My next winter bag sill have Dri-Down or some other DWR down treatment to prevent buildup of perspiration. Shaking DWR treated down in a sleeping bag will at least allow the frost to come off the down and accumulate on one side of the bag instead of permeating the entire bag. </p><p>**An alternative would be to have a synthetic top cover the down bag B/C that's where the moisture ascumulates as it condenses in the cooler outer layer. That top can then be shaken out IF a zipper revealing the insulation was installed to let the frost out.</p><p></p><p>Eric B.</p></blockquote><p></p>
[QUOTE="Litehiker, post: 1240869, member: 54178"] Andy, The neoprene divers' sox are closed cell neoprene, thus they form a vapor barrier. They usually have nitrogen filled bubbles inside them. Your foot pressure on the neoprene sox is a bit similar to the water pressure divers experience and they do resist compression quite well. Still, for best warmth, you need a decent closed cell foam insole, preferably a moldable one for better comfort and support. Hope this helps. As a former Nordic and alpine ski patroller I've found this system to be fairly foolproof and have used it successfully for over 20 years. BTW, breathable SealSkinz sox do [I]not[/I] fill the bill as a VBL. Breathable means they let sweat out - and into your boots' insulation. Wet insulation is compromised, cold insulation. Just remember to dry the VBL sox at night and change liner socks. "Cleanliness is next to Godliness." ;o) Studies show that your feet tend to actually sweat a bit less with VBLs because your feet sense they have enough sweat and cut back perspiration somewhat. It's similar to a sleeping bag VBL for extreme cold temps where the VBL causes you to sweat less. Wetting sleeping bag down from perspiration and breathing makes it heavier every night and bags can't dry B/C the dampness freezes in very cold temps. The ill-fated Scott South Pole expedition failed mostly due to frozen down bags, whereas the successful Norwegian expedition used reindeer hide bags which could have the frost shaken and beaten off. They also used skis for a faster transit, thus needing to haul less food. My next winter bag sill have Dri-Down or some other DWR down treatment to prevent buildup of perspiration. Shaking DWR treated down in a sleeping bag will at least allow the frost to come off the down and accumulate on one side of the bag instead of permeating the entire bag. **An alternative would be to have a synthetic top cover the down bag B/C that's where the moisture ascumulates as it condenses in the cooler outer layer. That top can then be shaken out IF a zipper revealing the insulation was installed to let the frost out. Eric B. [/QUOTE]
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