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Liquid cooling vests exist. I am merely building my own because I can and because I don't want to spend the $300+ price tag for one.
The tubing will not be in any direct sunlight and will be tight against my body (sewn onto my Under Armour shirt). I plan on wrapping the bladder in light foam and something like a thermal "emergency" blanket to pocket in the cold and keep any heat out (including my body heat).
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