She cut apart gel packs and ice packs, and reassembled them to create something that would be discreet and stay cold for a long time.

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The KoolCollar also comes with a gel filled insert that you freeze and use instead of ice (minus the secondary evaporative cooling) for indoor use, to provide cooling without the dripping water.

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The gel is usually used as a thickening agent in toothpaste, ice cream and baby milk.

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