Personalized Cystic Fibrosis Brother Youth T-Shirt. Show support with this purple butterfly awareness design that says Cystic Fibrosis I Love My Brother Youth T-Shirt - Vintage Royal Blue. 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.