Blizzard Survival tube test

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I spent the last three night in the 'Tube'...All three Tarpless

First night- 48 and clear.. cozy...
Second night 46 and very foggy.. I slept well, but woke a 4:30 to pee and found condensation on the inside of the tube.. I wasn't sweaty but the inside of the tube was..as I was wearing sweat shirt and pants it was't a problem. I was able to get right back to sleep...

Third night 46 and clear .. another good night no fog = no condensation

In the future I'll use my DIY Tyvek tarp if Fog is predicted..

Here are my Pix