"lightweight material that traps thermal energy when dry, but opens a series of tiny vents to let heat escape when a person starts sweating. The vents close again to retain heat once they are dry... bottom layer of nylon gets wet, it wants to expand like a sheet being pulled from its sides. But because it’s attached to the silver on top, it can’t stretch in those directions. The easiest option remaining is for the two-layer material to curl up, allowing the nylon to expand while forcing the silver to shrink"
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