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Inflatable hat
Water proof hat which can be inflated for exta thermal insolation | |
probably baked.... but how about a rainhat which you can inflate if the weather is cold, but packs small when its deflated. Can also be worn in warm weather in it's deflated state. Air's a good thermal insulator right?
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Not a fashion item then? Deflated hats don't look too good at the best of times. |
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Sure. Thermarest (tm) makes an inflatable sleeping pad that's waterproof nylon over foam, the foam minimizes air convection and provides superior insulation. Fill it with water during hot weather. |
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