The Chill-Its 6702 Cooling Bandana is an evaporative cooling headband designed to deliver instant cooling relief lasting up to four hours. This lightweight bandana is designed with polymer crystal technology embedded in a batting material for fast cooling. Embedding the polymer crystals reduces uneven expansion of the polymers when wet (less bulk, more comfort). Use the tie-closure to adjust the fit around the head, neck or wrists. Simply soak the cooling headwear in water for 2 to 5 minutes to activate. The water-absorbing polymer crystals inside will plump up slightly and provide a cooling sensation that lasts for hours. The new woven batting material will not become overly saturated and will not ooze or become slimy. Simply flip the cooling bandana over to refresh the cooling sensation. No ice or refrigeration is needed. Hang dry and rewet to activate. Great for construction, landscaping, roofing, or anybody working in the heat.