Personalized Best Teacher Ever Long Sleeve T-Shirt. Best Teacher Ever! Pow! Ka-boom! If you know a teacher who is a superhero, this is a great gift for them! Let them know they are the best teacher ever! 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