HeatMax EverCool Cooling Bandanas. CAMO, Pack of 10 - Reusable Chill out with EverCool Cooling Bandanas! EverCool Cooling Bandanas will help keep you cool in the hottest of weather at work or play. Soaked in water for 15-20 minutes the polymer absorbs the water and expand to over 100 times their original size. Warehouses, Factories, Cycling, Hiking, Fishing, Landscaping, Construction workers, Police. Firefighters, Utility Workers, Heat related health problems.