Originally Posted By: teacher
I've had luck with cooling bandanas -- evaporating bandannas

Yep, I've been using one of those for last two years. When I first bought and got it home, thought I'd been "had" –– couldn't imagine it "swelling up" as advertised (but of course, it did).
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"Things that have never happened before happen all the time." — Scott Sagan, The Limits of Safety