Personalized Irish Light Youth T-Shirt. You don't have to be Irish to be green text with the picture of an energy saving light bulb is a funny gift design for the energy conserving on St. Patrick's Day and Celtic events. 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.