UA Storm technology is light, nearly weightless, and just shrugs off the rain. Add it to our best hats and there's never an excuse to stay inside. 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 100% polyester