Patented fabric cools through evaporation. Simply wet the fabric, wring out excess water and in less than 5 minutes, the towel will be up to 25° cooler than the air temperature, keeping you cool, comfortable, and active no matter how hot it is. Cools up to 4 hours. When the towel dries and loses effectiveness, simply re-wet and you're ready to go again. Works with any temperature water. Great for indoor sports events. Guaranteed to keep its cool under any condition.