Simple to use. With the towel still in the plastic pouch, fill it with cool water, let it soak for a moment, and then wring it out. Seconds later, the water begins an evaporative process that absorbs heat from your skin and provides cool, instant relief. Since the microfiber towel is reusable, you can stay cool simply by repeating the process as often as necessary. 100% polyester. Machine washable.