Fabric: Stay cool covered and comfortable in this unstructured low-profile cap. Nike AeroBill technology integrates proprietary lightweight construction with breathable sweat-wicking fabric for enhanced comfort and reduced distraction. A hook and loop closure with pull tab ensures a custom fit. The contrast Swoosh logo is embroidered on the left-side middle panel. Made of 100% Dri-FIT polyester twill.Please note: Although this cap is noted as M/L on the label and on the ordering grid it is only offered in one size. It is One Size Fits All (OSFA).