Personalized Shamrock Baseballs Long Sleeve T-Shirt. Baseballs against a green shamrock is a unique Irish gift design for St. Patrick's Day. Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL