Personalized It's My Birthday Long Sleeve T-Shirt. It's my birthday! Colorful cake, balloons, candy, and presents help you celebrate your special day. Fun birthday gift! 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