Those "chill" bandanas... question

Im not sure exactly which style you are talking about, but I have two style of them I use at work.

One is the frogtogg chilly pad and the other is a cloth that has those crystals like a baby diaper.

They are basically swamp coolers that just use evaporation to help keep you cool. They slowly release their water content.

They come in handy under a hardhat when its a 100* outside.

I just recharge them in cold water when they get dry.

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Those "chill" bandanas... question