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. Ultra-light stretch woven fabric is durable & breathable. Iso-Chill sweatband helps disperse body heat, making it feel cool to the touch. Laser perforations for added ventilation where you need it. Low-profile, adjustable hook & loop closure to avoid hair snagging.