100% Cotton Fabric; 20% Cotton/ 80% Polyester Lining Head circumference: 22.5" WIDE BRIM: This sun hat has a wide brim which is 4" all the way around, the perfect length to shade your face and the back of your neck. FOLDABLE: This summer hat is packable and crushable, will still maintain its shape & can be easily carried inside your handbag or beach tote.