Personalized Engineer Shamrocks Youth T-Shirt. Engineer text surrounded by an oval of shamrocks is a unique design for the Irish and the Irish at heart on birthdays, holidays and St. Patrick's Day. 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.