Personalized Heart Elements Long Sleeve T-Shirt. A heart filled with Chemical Elements and their symbols is a unique chemistry design for students, teachers, chemists and chemical engineers. 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