Personalized Chemistry Smiley Long Sleeve T-Shirt. A smiling yellow face made from chemistry text with the caption Chemistry makes me smile is a humorous chemistry design. 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