PUT PREMIUM UP TOP. The Nike AeroBill Classic99 Hat is powered by sweat-wicking technology to help you stay dry throughout every round. A buckle closure, allover print and a braided bill rope deliver comfort and style. - Nike AeroBill technology combines breathability with sweat-wicking comfort. - Buckle closure lets you adjust the fit. - Embroidered eyelets enhance airflow. - Braided rope on the bill adds a touch of style. - Seasonal print is featured throughout. - Terry sweatband is soft and absorbent. - 100% POLYESTER