Personalized PIDD Support Bird Youth T-Shirt. PIDD Awareness Youth T-Shirt - Vintage Royal Blue has blue bird with blue ribbon for supporting those with primary immunodeficiency diseases. 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.