Runners need more from their hats than just keeping the sun out of their eyes. These are also light, stretchy, and breathable, with a built-in, cool-to-the-touch sweatband. Every runner needs a couple of these. Lightweight, durable woven fabric with trucker mesh side panels for breathability. Flat foam visor brim for added structure. Iso-Chill sweatband helps disperse body heat, making it feel cool to the touch. Adjustable snapback closure. Reflective details. 100% Polyester.