Personalized Robot 4th Birthday Long Sleeve T-Shirt. Robot 4th Birthday - A cute little robot wearing a birthday hat celebrates your little four year old's fourth birthday. 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