Stay cool with this cooling bandanna! Just soak in cold water for 10 minutes and let the cooling crystals plump up. They expand 400 times and turn into a cooling gel. If you need it even colder, throw it in the refrigerator. It will stay cool for 12 hours or more! Liquicool slowly dehydrates over two days. Simply re-soak to activate again. Keeps you cool even on the hottest days.