This 5 panel foam trucker hat fits most heads. It has a snap back adjustable closure with a structured crown. The mesh back ensures breathability while the front is structured for a classic look. 100% Polyester Front100% Polyester Mesh Back 5-panel cap Seamless Foam Front Panel with Lining Matching Color Braid 8 Rows Stitching on Visor Matching Fabric Undervisor Matching Color Sweatband Plastic Adjustable Snap- Adult (6 1/2 - 7 5/8)