Personalized Bubbly Chemical Engineers Long Sleeve T-Shirt. Chemical engineers are bubbly with bubbly text an a bubbling beaker is a humorous chemistry design. Fun engineering gifts for birthdays, holidays and 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