Personalized This Little Monster is Three Long Sleeve T-Shirt. This Little Monster is Three! A cute little green monster smiles because it is now three years old. Great birthday gift for your little 3 year old monster. 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