100% Polyester Breathable and comfortable Retro, Vintage Old-school Style St. patty’s day Trucker Hat Cap. Irish green shamrock Polyester Foam Mesh Cap. Perfect cap for St. Patrick’s day party and parade Show your Irish ride! Cool clover lucky charm hat for men and women 5-panel polyester foam front, mesh back. 4 structured crown. Plastic snap adjust – One size fits most.