Shirts By Sarah Big Boy's Funny St. Patrick's Day T-Shirt Irish Hooligan T-Shirt Big Boy's Sizing. Heavy 5.3 Oz. Cotton 100% preshrunk cotton sport gray contains 10% polyester Youth Size Information: S: 6-8 Medium: 10-12 Large: 14-16 X-Large: 18-20 (just smaller than an adult S) Proudly Printed In U.S.A. Taped Shoulder To Shoulder, Double Needle Stitched Throughout, Seamless Collar