Personalized Bubbly Chemical Engineers Youth T-Shirt. Chemical engineers are bubbly with bubbly text and a bubbling beaker is a humorous chemistry design. Fun engineering gifts for birthdays, holidays and graduation. Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.