UA Storm technology is light, nearly weightless, and just shrugs off the rain. Add it to the best hats and there's never an excuse to stay inside. Features UA Storm technology repels water without sacrificing breathability. Sweat-wicking, textured knit fabric is super-soft for all day comfort. Built-in, stretchy elastic sweatband wicks away sweat to keep you cool dry. Adjustable strap closure. Many colorways use a fluorine-free water-repellent treatment. Uses a fluorine-free water repellent treatment. 88% Polyester/12% Elastane.