Personalized Structural Engineering Smile Long Sleeve T-Shirt. Structural engineering text forming a smiling face with the text makes me smile is a humorous structural engineering design for birthdays, holidays nad graduation. 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