Personalized Coolest Chemical Engineer Long Sleeve T-Shirt. A hard hat topped snowman, holding a beaker and The world's coolest chemical engineer text is a funny design for birthdays and holidays. 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