Personalized I'm 21 T-Shirt. Happy birthday! You're legal! Visit your favorite bar & say: I'm 21. My ID finally has my own picture! Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.