Product Description The Chill-Its 6700CT Cooling Bandana features polymer crystal cooling technology for relief in extreme heat. Lightweight and low-profile, this comfortable cotton bandana is perfect for wear around the neck or under hard hats. A tie closure in the back makes for an adjustable, snug fit on a variety of head sizes. Polymer crystals are a simple, effective and comfortable solution for heat stress prevention. Similar to how sweat cools the body, evaporative technologies use an external water source to draw heat away” helping to regulate body temperature while providing cool relief. When activated, this cooling head wrap is comfortable and refreshing for even the hottest days of the year. HOW TO ACTIVATE Soak in water for 2-5 minutes to activate. The embedded polymer crystals will retain water for up to four hours of cooling relief. Be careful not to over activate as that may cause the bandana too plump up to a size where it is no longer able to be comfortably worn. From the Manufacturer Hot conditions are tough on workers and productivity. The Chill-Its Evaporative Series provides cooling through evaporation to keep workers comfortable all day long. This cost effective approach helps workers stay cool, fight fatigue, and increase productivity. And they’re reusable — just resoak 'em and you're good to go. Our Chill-Its Cooling line is the best way to battle heat from the foundry to freeway. Evaporative cooling bandanas, headbands, triangle hats, and hard hat inserts keep cool comfort on tap for hours. No matter what the application, Chill-Its sees to it that cooler heads prevail.