Personalized My Mom is the Worlds Best Teacher Long Sleeve T-Shirt. Teacher gift Long Sleeve T-Shirt - White has my Mom is the Worlds Best Teacher slogan for her little one to wear. 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