Personalized 4th Birthday Construction Truck Bulldozer Youth T-Shirt. Cute bulldozer for a 4 year old birthday party comes on a Youth T-Shirt - Black for a little boy 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.