the jaxon & james vented aussie hat is an australian style hat with a mesh crown and solid brim. the nylon mesh sides magnify the cool breeze around your head while the solid top and brim protects your head and face from the sun's harmful rays. the hat has a leather chin cord a cotton sweatband and cotton trim. this excellent summer item has a 2.75 inch wide brim and 4 inch high crown. hat details:65% polyester 35% cotton4 inch high mesh crown2.75 inch wide solid brimleather chin cordcotton sweat bandhat sizing info:small - 55cm medium - 57cm large - 59cm x-large - 61cm