Designed with a curved brim and stretch sweatband, the Tinfoil Hat contours to your head for all-day comfort. New Era® lends its 39THIRTY™ design to this Oakley hat for lasting durability, while a metal ellipse logo on the crown conveys the strength of an icon. Materials: 97% Cotton, 3% Polyester. Curved brim . Stretch sweatband. 9THIRTY™ design . Metal ellipse logo.