Personalized It's My Birthday Cupcake Long Sleeve T-Shirt. It's my birthday! A cool cupcake wearing sunglasses is throwing a big birthday party just for you. Balloons, party hats, confetti, and cupcakes! 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