Personalized Coolest Teacher Ever Long Sleeve T-Shirt. Coolest teacher ever! Who's the best teacher? This one! Two thumbs up for this teacher. Great gift for your favorite educator! 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