Cost is zero to fifteen dollars, depending on whether you already have a hat.
Important Safety Note: Use only plain ice or ice+water. Do NOT use salt to reduce the temperature, or frostbite is likely to result. Don' t even THINK about using dry ice (solid CO2) unless you want to need skin grafts on top of your head.
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Signing UpStep 1Gather Supplies
Hat with a high crown and a keeper (chin strap)
Quart-sized plastic freezer bags
Ice cubes
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