The Chill-Its 6702 Cooling Bandana features water-absorbing polymer crystals that are embedded in bandana material for relief in extreme heat. Embedded crystals will not ooze or become slimy. They are easy to activate. Simply soak in cold water 2 to 5 minutes to activate. No ice or refrigeration is needed. Lightweight bandana remains cool for up to 4 hours to help reduce effects of heat stress. Batting material minimizes uneven expansion of polymer crystals when wet for cooling without the bulk. One size fits most. The tie closure in the back allows close fit to the head, neck or wrist. This simple, effective and comfortable solution for heat stress prevention is similar to how sweat cools the body. It uses an external water source to draw heat away, helping to regulate body temperature while providing cool relief. When activated, this cooling bandana is comfortable and refreshing for even the hottest days of the year.